EP4169944A1 - Procédé de préparation d'immunoglobuline hybride contenant une liaison non peptidyle - Google Patents

Procédé de préparation d'immunoglobuline hybride contenant une liaison non peptidyle Download PDF

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Publication number
EP4169944A1
EP4169944A1 EP22181353.8A EP22181353A EP4169944A1 EP 4169944 A1 EP4169944 A1 EP 4169944A1 EP 22181353 A EP22181353 A EP 22181353A EP 4169944 A1 EP4169944 A1 EP 4169944A1
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Prior art keywords
reactive group
seq
antibody
terminal reactive
group
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German (de)
English (en)
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Daniel J. Capon
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Biomolecular Holdings LLC
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Biomolecular Holdings LLC
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    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
    • A61K47/00—Medicinal preparations characterised by the non-active ingredients used, e.g. carriers or inert additives; Targeting or modifying agents chemically bound to the active ingredient
    • A61K47/50—Medicinal preparations characterised by the non-active ingredients used, e.g. carriers or inert additives; Targeting or modifying agents chemically bound to the active ingredient the non-active ingredient being chemically bound to the active ingredient, e.g. polymer-drug conjugates
    • A61K47/51—Medicinal preparations characterised by the non-active ingredients used, e.g. carriers or inert additives; Targeting or modifying agents chemically bound to the active ingredient the non-active ingredient being chemically bound to the active ingredient, e.g. polymer-drug conjugates the non-active ingredient being a modifying agent
    • A61K47/68—Medicinal preparations characterised by the non-active ingredients used, e.g. carriers or inert additives; Targeting or modifying agents chemically bound to the active ingredient the non-active ingredient being chemically bound to the active ingredient, e.g. polymer-drug conjugates the non-active ingredient being a modifying agent the modifying agent being an antibody, an immunoglobulin or a fragment thereof, e.g. an Fc-fragment
    • A61K47/6835—Medicinal preparations characterised by the non-active ingredients used, e.g. carriers or inert additives; Targeting or modifying agents chemically bound to the active ingredient the non-active ingredient being chemically bound to the active ingredient, e.g. polymer-drug conjugates the non-active ingredient being a modifying agent the modifying agent being an antibody, an immunoglobulin or a fragment thereof, e.g. an Fc-fragment the modifying agent being an antibody or an immunoglobulin bearing at least one antigen-binding site
    • A61K47/6875—Medicinal preparations characterised by the non-active ingredients used, e.g. carriers or inert additives; Targeting or modifying agents chemically bound to the active ingredient the non-active ingredient being chemically bound to the active ingredient, e.g. polymer-drug conjugates the non-active ingredient being a modifying agent the modifying agent being an antibody, an immunoglobulin or a fragment thereof, e.g. an Fc-fragment the modifying agent being an antibody or an immunoglobulin bearing at least one antigen-binding site the antibody being a hybrid immunoglobulin
    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07K—PEPTIDES
    • C07K16/00—Immunoglobulins [IGs], e.g. monoclonal or polyclonal antibodies
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
    • A61K47/00—Medicinal preparations characterised by the non-active ingredients used, e.g. carriers or inert additives; Targeting or modifying agents chemically bound to the active ingredient
    • A61K47/50—Medicinal preparations characterised by the non-active ingredients used, e.g. carriers or inert additives; Targeting or modifying agents chemically bound to the active ingredient the non-active ingredient being chemically bound to the active ingredient, e.g. polymer-drug conjugates
    • A61K47/51—Medicinal preparations characterised by the non-active ingredients used, e.g. carriers or inert additives; Targeting or modifying agents chemically bound to the active ingredient the non-active ingredient being chemically bound to the active ingredient, e.g. polymer-drug conjugates the non-active ingredient being a modifying agent
    • A61K47/68—Medicinal preparations characterised by the non-active ingredients used, e.g. carriers or inert additives; Targeting or modifying agents chemically bound to the active ingredient the non-active ingredient being chemically bound to the active ingredient, e.g. polymer-drug conjugates the non-active ingredient being a modifying agent the modifying agent being an antibody, an immunoglobulin or a fragment thereof, e.g. an Fc-fragment
    • A61K47/6801—Drug-antibody or immunoglobulin conjugates defined by the pharmacologically or therapeutically active agent
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
    • A61K47/00—Medicinal preparations characterised by the non-active ingredients used, e.g. carriers or inert additives; Targeting or modifying agents chemically bound to the active ingredient
    • A61K47/50—Medicinal preparations characterised by the non-active ingredients used, e.g. carriers or inert additives; Targeting or modifying agents chemically bound to the active ingredient the non-active ingredient being chemically bound to the active ingredient, e.g. polymer-drug conjugates
    • A61K47/51—Medicinal preparations characterised by the non-active ingredients used, e.g. carriers or inert additives; Targeting or modifying agents chemically bound to the active ingredient the non-active ingredient being chemically bound to the active ingredient, e.g. polymer-drug conjugates the non-active ingredient being a modifying agent
    • A61K47/68—Medicinal preparations characterised by the non-active ingredients used, e.g. carriers or inert additives; Targeting or modifying agents chemically bound to the active ingredient the non-active ingredient being chemically bound to the active ingredient, e.g. polymer-drug conjugates the non-active ingredient being a modifying agent the modifying agent being an antibody, an immunoglobulin or a fragment thereof, e.g. an Fc-fragment
    • A61K47/6835—Medicinal preparations characterised by the non-active ingredients used, e.g. carriers or inert additives; Targeting or modifying agents chemically bound to the active ingredient the non-active ingredient being chemically bound to the active ingredient, e.g. polymer-drug conjugates the non-active ingredient being a modifying agent the modifying agent being an antibody, an immunoglobulin or a fragment thereof, e.g. an Fc-fragment the modifying agent being an antibody or an immunoglobulin bearing at least one antigen-binding site
    • A61K47/6851—Medicinal preparations characterised by the non-active ingredients used, e.g. carriers or inert additives; Targeting or modifying agents chemically bound to the active ingredient the non-active ingredient being chemically bound to the active ingredient, e.g. polymer-drug conjugates the non-active ingredient being a modifying agent the modifying agent being an antibody, an immunoglobulin or a fragment thereof, e.g. an Fc-fragment the modifying agent being an antibody or an immunoglobulin bearing at least one antigen-binding site the antibody targeting a determinant of a tumour cell
    • A61K47/6855—Medicinal preparations characterised by the non-active ingredients used, e.g. carriers or inert additives; Targeting or modifying agents chemically bound to the active ingredient the non-active ingredient being chemically bound to the active ingredient, e.g. polymer-drug conjugates the non-active ingredient being a modifying agent the modifying agent being an antibody, an immunoglobulin or a fragment thereof, e.g. an Fc-fragment the modifying agent being an antibody or an immunoglobulin bearing at least one antigen-binding site the antibody targeting a determinant of a tumour cell the tumour determinant being from breast cancer cell
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
    • A61K47/00—Medicinal preparations characterised by the non-active ingredients used, e.g. carriers or inert additives; Targeting or modifying agents chemically bound to the active ingredient
    • A61K47/50—Medicinal preparations characterised by the non-active ingredients used, e.g. carriers or inert additives; Targeting or modifying agents chemically bound to the active ingredient the non-active ingredient being chemically bound to the active ingredient, e.g. polymer-drug conjugates
    • A61K47/51—Medicinal preparations characterised by the non-active ingredients used, e.g. carriers or inert additives; Targeting or modifying agents chemically bound to the active ingredient the non-active ingredient being chemically bound to the active ingredient, e.g. polymer-drug conjugates the non-active ingredient being a modifying agent
    • A61K47/68—Medicinal preparations characterised by the non-active ingredients used, e.g. carriers or inert additives; Targeting or modifying agents chemically bound to the active ingredient the non-active ingredient being chemically bound to the active ingredient, e.g. polymer-drug conjugates the non-active ingredient being a modifying agent the modifying agent being an antibody, an immunoglobulin or a fragment thereof, e.g. an Fc-fragment
    • A61K47/6889—Conjugates wherein the antibody being the modifying agent and wherein the linker, binder or spacer confers particular properties to the conjugates, e.g. peptidic enzyme-labile linkers or acid-labile linkers, providing for an acid-labile immuno conjugate wherein the drug may be released from its antibody conjugated part in an acidic, e.g. tumoural or environment
    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07K—PEPTIDES
    • C07K16/00—Immunoglobulins [IGs], e.g. monoclonal or polyclonal antibodies
    • C07K16/18—Immunoglobulins [IGs], e.g. monoclonal or polyclonal antibodies against material from animals or humans
    • C07K16/24—Immunoglobulins [IGs], e.g. monoclonal or polyclonal antibodies against material from animals or humans against cytokines, lymphokines or interferons
    • C07K16/241—Tumor Necrosis Factors
    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07K—PEPTIDES
    • C07K16/00—Immunoglobulins [IGs], e.g. monoclonal or polyclonal antibodies
    • C07K16/46—Hybrid immunoglobulins
    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07K—PEPTIDES
    • C07K2317/00—Immunoglobulins specific features
    • C07K2317/20—Immunoglobulins specific features characterized by taxonomic origin
    • C07K2317/21—Immunoglobulins specific features characterized by taxonomic origin from primates, e.g. man
    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07K—PEPTIDES
    • C07K2317/00—Immunoglobulins specific features
    • C07K2317/50—Immunoglobulins specific features characterized by immunoglobulin fragments
    • C07K2317/52—Constant or Fc region; Isotype
    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07K—PEPTIDES
    • C07K2317/00—Immunoglobulins specific features
    • C07K2317/50—Immunoglobulins specific features characterized by immunoglobulin fragments
    • C07K2317/55—Fab or Fab'
    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07K—PEPTIDES
    • C07K2317/00—Immunoglobulins specific features
    • C07K2317/70—Immunoglobulins specific features characterized by effect upon binding to a cell or to an antigen
    • C07K2317/76—Antagonist effect on antigen, e.g. neutralization or inhibition of binding

Definitions

  • This application incorporates-by-reference nucleotide and/or amino acid sequences which are present in the file named "150313_0893_86450_PCT_Sequence_Listing_REB.txt,” which is 499 kilobytes in size, and which was created March 13, 2015 in the IBM-PC machine format, having an operating system compatibility with MS-Windows, which is contained in the text file filed March 13, 2015 as part of this application.
  • Proteins prefer to form compact globular or fibrous structures, minimizing their exposure to solvent. This tendency is inherent both in the polypeptide backbone with its propensity for hydrogen-bonded secondary structure, and in side chain interactions that promote tertiary folding. Thus, previous efforts to introduce "flexibility" into antibodies using peptides have been largely inadequate. For example, it is common to employ combinations of an amino acid that favors solvent interactions (e.g., serine) with one that breaks up helical structure (e.g., glycine).
  • solvent interactions e.g., serine
  • helical structure e.g., glycine
  • sequences are likely to create additional problems due to their intrinsic immunogenicity and proteolytic susceptibility.
  • the present invention provides a compound having the structure: A-B-----Z
  • the present invention also provides a compound having the structure: L-R a -B-----Z
  • the present invention also provides a process for producing a compound having the structure: A-B-----Z
  • the present invention provides a compound having the structure: A-B-----Z
  • the cysteine or selenocysteine naturally occurs in the stretch of consecutive amino acids. In some embodiments, the cysteine or selenocysteine does not naturally occur in the stretch of consecutive amino acids.
  • the F c domain of an antibody is a naturally occurring F c domain of an antibody.
  • the F c domain of an antibody is a variant F c domain of an antibody.
  • the variant F c domain of an antibody is a mutated F c domain of an antibody.
  • the mutated F c domain is a substitution mutant.
  • the substitution mutant has an amino acid substitution at the N-terminus, the C-terminus, or at a position of the F c domain other than the N-terminus or the C-terminus.
  • the substitution mutant has 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 10-15, 15-20, 10-20, or 20-50 amino acid sustitutions in the stretch of consecutive amino acids thereof.
  • the substitutions are conservative amino acid substitutions.
  • the mutated mutated F c domain is an amino acid addition mutant.
  • the amino acid addition mutant has 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 10-15, 15-20, 10-20, or 20-50 added amino acids in the stretch of consecutive amino acids thereof.
  • the mutated F c domain is an amino acid deletion mutant.
  • the amino acid deletion mutant has 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 10-15, 15-20, 10-20, or 20-50 deleted amino acids in the stretch of consecutive amino acids thereof.
  • the consecutive amino acids are identical to a stretch of at least 0, 20, 30, 40, 50, 60, 70, 80, 90, 100, 110, 120, 130, 140, 150, 160, 170, 180, or 190 consecutive amino acids present in the chain of the F c domain of the antibody.
  • the consecutive amino acids are identical to the stretch of amino acids in the hinge region, the CH2 region or the CH3 region of the Fc domain, or a portion thereof.
  • the solid line between A and B represents a nonpeptidyl linkage comprising the structure:
  • the solid line between A and B represents a nonpeptidyl linkage comprising the structure: or wherein R 1 is H or is part of an additional structure that is a cyclic structure, wherein the additional cyclic structure comprises R 1 or a portion of R 1 , and may also comprise R 2 or a portion of R 2 , and the carbon between R 2 and the alkene double bond.
  • the solid line between A and B represents a nonpeptidyl linkage comprising the structure: wherein R 1 is H or is part of an additional structure that is a cyclic structure, wherein the additional cyclic structure comprises R 1 or a portion of R 1 , and may also comprise R 2 or a portion of R 2 , and the carbon between R 2 and the alkene double bond.
  • the solid line between A and B represents a nonpeptidyl linkage comprising the structure: wherein R 1 is part of an additional structure that is a cyclic structure, wherein the additional cyclic structure comprises R 1 or a portion of R 1 , and may also comprise R 2 or a portion of R 2 , and the carbon between R 2 and the alkene double bond.
  • the solid line between A and B represents a nonpeptidyl linkage comprising the structure: wherein R 1 is part of an additional structure that is a cyclic structure, wherein the additional cyclic structure comprises R 1 or a portion of R 1 , and may also comprise R 2 or a portion of R 2 , and the carbon between R 2 and the alkene double bond.
  • R 1 and R 2 are linked via at least one direct bond so as to form a cyclic structure comprising
  • R 1 is selected from the group consisting of: which is optionally substituted at any position.
  • R 1 is , which is optionally substituted at any position.
  • R 1 is , which is optionally substituted at any position.
  • R 1 is which is optionally substituted at any position.
  • the carbon between R 2 and the alkene double bond is:
  • the carbon between R 2 and the alkene double bond is substituted with two hydrogens and directly bonded to R 2 with a single bond.
  • the carbon between R 2 and the alkene double bond is directly bonded to R 2 via a double bond and a single bond.
  • the carbon between R 2 and the alkene double bond is directly bonded to R 2 via a double bond and a single bond so as to form a phenyl ring which is optionally substituted at any position.
  • R 2 is , wherein R 2 is attached to A or B via J, and
  • R 2 is wherein R 2 is attached to A or B via J, and
  • R 2 is
  • R 2 is which is optionally substituted at any position.
  • R 2 is which is optionally substituted at any position.
  • R 2 is which is optionally substituted at any position.
  • R 2 is which is optionally substituted at any position.
  • R 2 is which is optionally substituted at any position.
  • R 2 is which is optionally substituted at any position.
  • R 1 and R 2 taken together are:
  • R 1 and R 2 taken together are which is optionally substituted at any position.
  • R 1 and R 2 taken together are which is optionally substituted at any position.
  • the solid line between A and B represents a nonpeptidyl linkage comprising the structure:
  • the solid line between A and B represents a nonpeptidyl linkage comprising the structure: which is optionally substituted at any position.
  • the solid line between A and B represents a nonpeptidyl linkage comprising the structure: which is optionally substituted at any position,.
  • the solid line between A and B represents a nonpeptidyl linkage comprising the structure:
  • the solid line between A and B represents a nonpeptidyl linkage comprising the structure: which is optionally substituted at any position.
  • the solid line between A and B represents a nonpeptidyl linkage comprising the structure: which is optionally substituted at any position.
  • the solid line between A and B represents a nonpeptidyl linkage comprising the structure:
  • the solid line between A and B represents a nonpeptidyl linkage comprising the structure: which is optionally substituted at any position.
  • the solid line between A and B represents a nonpeptidyl linkage comprising the structure: which is optionally substituted at any position.
  • the solid line between A and B represents a nonpeptidyl linkage comprising the structure:
  • the solid line between A and B represents a nonpeptidyl linkage comprising the structure: which is optionally substituted at any position.
  • the solid line between A and B represents a nonpeptidyl linkage comprising the structure: which is optionally substituted at any position.
  • the solid line between A and B represents a nonpeptidyl linkage comprising the structure:
  • R 1 is H.
  • J is an organic structure comprising a [PEG(y)]z group.
  • J is an organic structure comprising a polyalkylene glycol, polyoxyalkylated polyol, polyvinyl alcohol, polyvinyl alkyl ether, poly(lactic acid), poly(lactic-glycolic acid), or polysaccharide group.
  • J is an organic structure comprising a C 1 -C 4 alkyl group.
  • J is an organic structure comprising a succinimide.
  • J is an organic structure comprising amine.
  • J is an organic structure comprising a succinyl, malonyl, glutaryl, phthalyl or adipoyl.
  • J is an organic structure comprising a malonyl.
  • J is an organic structure comprising an amino acid.
  • J is an organic structure comprising a cysteine.
  • J is an organic structure comprising a lysine.
  • J is an organic structure consisting of a chain of 3 moieties selected from the group consisting of [PEG(y)]z, polyalkylene glycol, polyoxyalkylated polyol, polyvinyl alcohol, polyvinyl alkyl ether, poly(lactic acid), poly(lactic-glycolic acid), polysaccharide, a branched residue, C 1 -C 10 alkyl, C 3 -C 10 cycloalkane, C 2 -C 10 alkene, C 5 -C 10 cycloalkene, amine, sulfur, oxygen, succinimide, maleimide, glycerol, triazole, isoxazolidine, C 2 -C 5 acyl, C 2 -C 5 acylamino, C 2 -C 5 acyloxy, succinyl, malonyl, glutaryl, phthalyl, adipoyl, an amino acid, an aryl group, a heteroaryl group, a
  • J is an organic structure consisting of a chain of four moieties selected from the group consisting of [PEG(y)]z, polyalkylene glycol, polyoxyalkylated polyol, polyvinyl alcohol, polyvinyl alkyl ether, poly(lactic acid), poly(lactic-glycolic acid), polysaccharide, a branched residue, C 1 -C 10 alkyl, C 3 -C 10 cycloalkane, C 2 -C 10 alkene, C 5 -C 10 cycloalkene, amine, sulfur, oxygen, succinimide, maleimide, glycerol, triazole, isoxazolidine, C 2 -C 5 acyl, C 2 -C 5 acylamino, C 2 -C 5 acyloxy, succinyl, malonyl, glutaryl, phthalyl, adipoyl, an amino acid, an aryl group, a heteroaryl group, a
  • J is an organic structure consisting of a chain of five moieties selected from the group consisting of [PEG(y)]z, polyalkylene glycol, polyoxyalkylated polyol, polyvinyl alcohol, polyvinyl alkyl ether, poly(lactic acid), poly(lactic-glycolic acid), polysaccharide, a branched residue, C 1 -C 10 alkyl, C 3 -C 10 cycloalkane, C 2 -C 10 alkene, C 5 -C 10 cycloalkene, amine, sulfur, oxygen, succinimide, maleimide, glycerol, triazole, isoxazolidine, C 2 -C 5 acyl, C 2 -C 5 acylamino, C 2 -C 5 acyloxy, succinyl, malonyl, glutaryl, phthalyl, adipoyl, an amino acid, an aryl group, a heteroaryl group, a
  • J comprises a [PEG(y)]z group bonded to a lysine.
  • J comprises a C 1 -C 4 acyl group bonded to a succinimide group.
  • J comprises a lysine bonded to a C 1 -C 4 acyl.
  • J comprises a [PEG(y)]z group, which is bonded to a glutaryl.
  • J is an organic structure consisting of a chain of five moieties selected from the group consisting of [PEG(y)]z, C 2 -C 5 acyl, succinyl, malonyl, glutaryl, an amino acid, a chemical structure containing a cyclooctane fused to a dihydropyridazine, a chemical structure containing a cyclooctene fused to a triazole, a chemical structure containing a cyclooctene fused to a isoxazolidine, a dibenzocyclooctene, a dibenzoazacyclooctene,
  • J is a bond
  • J is a cysteine
  • J has the structure: wherein n 1-3, m is 1-4, y is 1-100 and z is 1-10.
  • J has a linear structure.
  • J has a branched structure.
  • R 2 is , or wherein n 1-3, m is 1-4, y is 1-100 and z is 1-10.
  • R 2 is wherein n 1-3, m is 1-4, y is 1-100 and z is 1-10.
  • R 2 is wherein n 1-3, m is 1-4, y is 1-100 and z is 1-10.
  • R 1 and R 2 taken together are: or wherein n 1-3, m is 1-4, y is 1-100 and z is 1-10.
  • R 1 and R 2 taken together are: wherein n 1-3, m is 1-4, y is 1-100 and z is 1-10.
  • R 1 and R 2 taken together are: wherein n 1-3, m is 1-4, y is 1-100 and z is 1-10.
  • the solid line between A and B represents a nonpeptidyl linkage comprising the structure: or
  • the solid line between A and B represents a nonpeptidyl linkage comprising the structure:
  • the solid line between A and B represents a nonpeptidyl linkage comprising the structure:
  • the solid line between A and B represents a nonpeptidyl linkage comprising the structure: or
  • y is 1-20. In some embodiments, y is 21-40. In some embodiments, y is 41-60. In some embodiments, y is 61-80. In some embodiments, y is 30-50. In some embodiments, y is 12, 24, 36 or 48. In some embodiments, z is 1. In some embodiments, z is 0.
  • the terminal carbonyl is of the [PEG(y)]z group is part of an amide bond.
  • the terminal amine of the [PEG(y)]z group is part of an amide bond.
  • R 4 is wherein x is 1-100, and w is 0-5.
  • x is 1-20. In some embodiments, x is 21-40. In some embodiments, x is 41-60. In some embodiments, x is 61-80. In some embodiments, x is 30-50. In some embodiments, x is 12, 24, 36 or 48.
  • w is 1. In some embodiments, w is 0.
  • R 4 has the structure:
  • R 2 is attached A to via J, and R 4 is attached to B.
  • R 2 is attached B to via J, and R 4 is attached to A.
  • R 4 is attached to B via the terminal carbonyl carbon.
  • erein R 2 is attached to A via a carbon-nitrogen bond or a carbon-sulfur bond.
  • R 2 is attached to A via a carbon-nitrogen bond.
  • the carbon-nitrogen bond is an amide bond.
  • R 2 is attached to A via a biologically labile bond.
  • R 2 is attached to A via an amide bond between the C-terminal amino acid of A and an amino group in B.
  • the terminal amino acid is cysteine.
  • R 2 is attached to A via a carbon-sulfur bond.
  • R 2 is attached to A via a carbon-sulfur bond formed between R 2 and a free thiol.
  • R 2 is attached to A via a succinimide-sulfur bond.
  • J comprises a branched residue
  • J is attached to more than one A via the branched residue.
  • B comprises a branched residue
  • B is linked to more than one A, each via a nonpeptidyl linkage with the branched residue.
  • the solid line between A and B represents a nonpeptidyl linkage comprising the structure:
  • X a has the structure:
  • X a has the structure:
  • R a is connected to the cyclooctane and R b is connected to the dihydropyridazine.
  • the solid line between A and B represents a nonpeptidyl linkage comprising the structure:
  • X a has the structure:
  • R c is methyl
  • R a and R b are independently a bond or an organic structure comprising or consisting of a chain of 1, 2, 3, 4, 5, 6, 7, 8, 9, 10 or more moieties, wherein each moiety is independently selected from the group consisting of [PEG(y)]z, polyalkylene glycol, polyoxyalkylated polyol, polyvinyl alcohol, polyvinyl alkyl ether, poly(lactic acid), poly(lactic-glycolic acid), polysaccharide, a branched residue, C 1 -C 10 alkyl, C 3 -C 10 cycloalkane, C 2 -C 10 alkene, C 5 -C 10 cycloalkene, amine, sulfur, oxygen, succinimide, maleimide, glycerol, triazole, isoxazolidine, C 2 -C 5 acyl, C 2 -C 5 acylamino, C 2 -C 5 acyloxy, succinyl, malonyl, glutary
  • R a and R b are independently a bond or an organic structure comprising or consisting of a chain of 1, 2, 3, 4, 5, 6, 7, 8, 9, 10 or more moieties, wherein each moiety is independently selected from the group consisting of [PEG(y)]z, C 2 -C 5 acyl, succinyl, malonyl, glutaryl, an amino acid, a chemical structure containing a cyclooctane fused to a dihydropyridazine, a chemical structure containing a cyclooctene fused to a triazole, a chemical structure containing a cyclooctene fused to a isoxazolidine, a dibenzocyclooctene, a dibenzoazacyclooctene, and
  • Ra or Rb is attached to A via a carbon-nitrogen bond or a carbon-sulfur bond.
  • Ra or Rb is attached to A via a carbon-nitrogen bond.
  • the carbon-nitrogen bond is an amide bond.
  • Ra or Rb is attached to A via a biologically labile bond.
  • Ra or Rb is is attached to A via an amide bond between the C-terminal amino acid of A and an amino group in B.
  • the terminal amino acid is cysteine.
  • Ra or Rb is is attached to A via a carbon-sulfur bond.
  • Ra or Rb is is attached to A via a carbon-sulfur bond formed between R 2 and a free thiol.
  • Ra or Rb is is attached to A via a succinimide-sulfur bond.
  • Ra or Rb comprises a branched residue.
  • Ra or Rb is is attached to more than one A via the branched residue.
  • the biological activity of A is increased when it is part of a compound or dimer of the invention compared to the biological activity of A when it is not linked to any other structure.
  • A comprises the structure of a compound that is a drug approved for treating a subject afflicted with a disease.
  • the subject is a mammalian subject.
  • the mammalian subject is a human subject.
  • A comprises the structure of an organic compound having a molecular weight less than 1000 Daltons, a DNA aptamer, an RNA aptamer, an oligonucleotide, or a protein that is biologically active.
  • the oligonucleotide is an antisense oligonucleotide.
  • the oligonucleotide is an RNA interference inducing molecule.
  • the oligonucleotide encodes an RNA interference inducing molecule.
  • A comprises a primary or a secondary amine.
  • A is linked to B via the primary or secondary amine.
  • A comprises a primary amine.
  • A is aripiprazole or oseltamivir.
  • A comprises a secondary amine.
  • A is a respiratory drug, an antiasthmatic agent, an analgesic agent, an antidepressant, an antianginal agent, an antiarrhythmic agent, an antihypertensive agent, an antidiabetic agent, an antihistamine, an anti-infective agent, an antibiotic, an antiinflamatory agent, an antiparkinsonism drug, an antipsychotics, an antipyretic agent, an antiulcer agent, an attention deficit hyperactivity disorder (ADHD) drug, a central nervous system stimulant, a decongestant, or a psychostimulant.
  • ADHD attention deficit hyperactivity disorder
  • A is alprenolol, acebutolol, amidephrine, amineptine, amosulalol, amoxapine, amphetaminil, atenolol, atomoxetine, balofloxacin, bamethan, befunolol, benazepril, benfluorex, benzoctamine, betahistine, betaxolol, bevantolol, bifemelane, bisoprolol, brinzolamide, bufeniode, butethamine, camylofine, carazolol, carticaine, carvedilol, cephaeline, ciprofloxacin, cloZapine, clobenZorex, clorprenaline, cyclopentamine, delapril, demexiptiline, denopamine, desipramine, desloratadine, diclofenac,
  • A comprises a protein that is biologically active.
  • A comprises a secreted protein.
  • A comprises an extracellular domain of a protein.
  • A is biologically active such that it has target-binding activity.
  • the A is an independently-folding protein or a portion thereof.
  • A is a glycosylated protein.
  • A comprises intra-chain disulfide bonds.
  • A binds a cytokine.
  • the cytokine is TNF ⁇ .
  • A comprises Atrial Natriuretic Peptide (ANP), Calcitonin, Corticotropin Releasing Hormone (CRH), Endothelin, Exenatide, Gastric Inhibitory Peptide (GIP), Glucagon-Like Peptide-1 (GLP-1), Glucagon-Like Peptide-2 (GLP-2), an analog of GLP-1 or GLP-2, Glucagon Vasoactive Intestinal Peptide (GVIP), Ghrelin, Peptide YY or Secretin, or a portion thereof.
  • ANP Atrial Natriuretic Peptide
  • Calcitonin Calcitonin
  • CHL Corticotropin Releasing Hormone
  • CH Corticotropin Releasing Hormone
  • GIP Gastric Inhibitory Peptide
  • GLP-1 Glucagon-Like Peptide-1
  • GLP-2 Glucagon-Like Peptide-2
  • GVIP Glucagon Vasoactive Intestinal Peptide
  • A comprises a stretch of consecutive amino acids in the sequence HGEGTFTSDVSSYLEEQAAKEFIAWLVKGRG.
  • A comprises at least one stretch of consecutive amino acids which are identical to a stretch of consecutive amino acids present in the heavy chain of a Fab or a Fab' of an antibody.
  • A comprises at least one at least one stretch of consecutive amino acids which are identical to a stretch of consecutive amino acids present in the light chain of a Fab or a Fab' of an antibody.
  • A comprises at least one Fab or Fab' of an antibody, or a portion of the at least one Fab or Fab'.
  • A comprises at least 2, 3, 4, 5, 6, 7, 8, 9, or 10 copies of the Fab or Fab' or portion thereof.
  • A comprises Fab-1 or Fab'1, or a portion thereof of the antibody.
  • A comprises Fab-2 or Fab'2, or a portion thereof of the antibody.
  • A comprises two Fab or Fab' hands of the antibody.
  • the Fab or Fab' is present in adalimumab
  • A comprises at least one stretch of consecutive amino acids which are identical to a stretch of consecutive amino acids present in a single chain antibody.
  • A comprises at least one stretch of consecutive amino acids which are identical to a stretch of consecutive amino acids present in a TNF ⁇ receptor.
  • the TNF ⁇ receptor is TNR1B.
  • a compound of the invention forms part of a homodimer.
  • a compound of the invention forms part of a heterodimer.
  • the present invention provides homodimers comprising compounds of the invention.
  • the present invention provides heterodimers comprising compounds of the invention.
  • each compound of the dimer is capable of binding to the other by at least one disulfide bond.
  • each compound of the dimer is capable of binding to the other by at least one disulfide bond between the Z of each compound.
  • each compound of the dimer is bound to the other by at least one disulfide bond.
  • each compound of the dimer is bound to the other by at least one disulfide bond between the Z of each compound.
  • each compound of the dimer is non-covalently bound to the other.
  • the present invention provides a compound having the structure: L-R a -B-----Z
  • the cysteine or selenocysteine naturally occurs in the stretch of consecutive amino acids. In some embodiments, the cysteine or selenocysteine does not naturally occur in the stretch of consecutive amino acids.
  • the F c domain of an antibody is a naturally occurring F c domain of an antibody.
  • the F c domain of an antibody is a variant F c domain of an antibody.
  • the variant F c domain of an antibody is a mutated F c domain of an antibody.
  • the mutated F c domain is a substitution mutant.
  • the substitution mutant has an amino acid substitution at the N-terminus, the C-terminus, or at a position of the F c domain other than the N-terminus or the C-terminus.
  • the substitution mutant has 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 10-15, 15-20, 10-20, or 20-50 amino acid sustitutions in the stretch of consecutive amino acids thereof.
  • the substitutions are conservative amino acid substitutions.
  • the mutated mutated F c domain is an amino acid addition mutant.
  • the amino acid addition mutant has 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 10-15, 15-20, 10-20, or 20-50 added amino acids in the stretch of consecutive amino acids thereof.
  • the mutated F c domain is an amino acid deletion mutant.
  • the amino acid deletion mutant has 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 10-15, 15-20, 10-20, or 20-50 deleted amino acids in the stretch of consecutive amino acids thereof.
  • the consecutive amino acids are identical to a stretch of at least 0, 20, 30, 40, 50, 60, 70, 80, 90, 100, 110, 120, 130, 140, 150, 160, 170, 180, or 190 consecutive amino acids present in the chain of the F c domain of the antibody.
  • the consecutive amino acids are identical to the stretch of amino acids in the hinge region, the CH2 region or the CH3 region of the Fc domain, or a portion thereof.
  • L is -N 3 .
  • L is N
  • L is an alkyne
  • the alkyne is a propargyl group.
  • the alkyne is a cyclooctyne group.
  • the alkyne has the structure: wherein X 1 is CH or N, X 2 is CH 2 or a carbonyl group, and R5 is an aryl or alkyl group.
  • the alkyne has the structure:
  • L is a tetrazine
  • the tetrazine has the structure: wherein Rc is H, alkyl or aryl.
  • the tetrazine has the structure: wherein Rc is H, alkyl or aryl.
  • the tetrazine has the structure:
  • the tetrazine has the structure:
  • L is trans-cyclooctene.
  • the trans-cyclooctene has the structure:
  • the trans-cyclooctene has the structure:
  • Ra or Rb is an organic structure comprising a [PEG(y)]z group.
  • Ra or Rb is an organic structure comprising a polyalkylene glycol, polyoxyalkylated polyol, polyvinyl alcohol, polyvinyl alkyl ether, poly(lactic acid), poly(lactic-glycolic acid), or polysaccharide group.
  • Ra or Rb is an organic structure comprising a C 1 -C 4 alkyl group.
  • Ra or Rb is an organic structure comprising a succinimide.
  • Ra or Rb is an organic structure comprising an amine.
  • Ra or Rb is an organic structure comprising a succinyl, malonyl, glutaryl, phthalyl or adipoyl.
  • Ra or Rb is an organic structure comprising a malonyl.
  • Ra or Rb is an organic structure comprising an amino acid.
  • Ra or Rb is an organic structure comprising a cysteine.
  • Ra or Rb is an organic structure comprising a lysine.
  • Ra or Rb is an organic structure consisting of a chain of 3 moieties selected from the group consisting of [PEG(y)]z, polyalkylene glycol, polyoxyalkylated polyol, polyvinyl alcohol, polyvinyl alkyl ether, poly(lactic acid), poly(lactic-glycolic acid), polysaccharide, a branched residue, C 1 -C 10 alkyl, C 3 -C 10 cycloalkane, C 2 -C 10 alkene, C 5 -C 10 cycloalkene, amine, sulfur, oxygen, succinimide, maleimide, glycerol, triazole, isoxazolidine, C 2 -C 5 acyl, C 2 -C 5 acylamino, C 2 -C 5 acyloxy, succinyl, malonyl, glutaryl, phthalyl, adipoyl, an amino acid, an aryl group, a heteroaryl group
  • Ra or Rb is an organic structure consisting of a chain of five moieties selected from the group consisting of [PEG(y)]z, polyalkylene glycol, polyoxyalkylated polyol, polyvinyl alcohol, polyvinyl alkyl ether, poly(lactic acid), poly(lactic-glycolic acid), polysaccharide, a branched residue, C 1 -C 10 alkyl, C 3 -C 10 cycloalkane, C 2 -C 10 alkene, C 5 -C 10 cycloalkene, amine, sulfur, oxygen, succinimide, maleimide, glycerol, triazole, isoxazolidine, C 2 -C 5 acyl, C 2 -C 5 acylamino, C 2 -C 5 acyloxy, succinyl, malonyl, glutaryl, phthalyl, adipoyl, an amino acid, an aryl group, a heteroaryl group
  • Ra or Rb comprises a [PEG(y)]z group bonded to a lysine.
  • Ra or Rb comprises a C 1 -C 4 acyl group bonded to a succinimide group.
  • Ra or Rb comprises a lysine bonded to a C 1 -C 4 acyl.
  • Ra or Rb comprises a [PEG(y)]z group, which is bonded to a glutaryl.
  • Ra or Rb is an organic structure consisting of a chain of three, four or five moieties selected from the group consisting of [PEG(y)]z, C 2 -C 5 acyl, succinyl, malonyl, glutaryl, an amino acid, a chemical structure containing a cyclooctane fused to a dihydropyridazine, a chemical structure containing a cyclooctene fused to a triazole, a chemical structure containing a cyclooctene fused to a isoxazolidine, a dibenzocyclooctene, a dibenzoazacyclooctene, and
  • Ra or Rb is a bond
  • Ra or Rb is a cysteine
  • Ra or Rb has a linear structure.
  • Ra or Rb has a branched structure.
  • y is 1-20. In some embodiments, y is 21-40. In some embodiments, y is 41-60. In some embodiments, y is 61-80. In some embodiments, y is 30-50. In some embodiments, y is 12, 24, 36 or 48.
  • z is 1.
  • the terminal carbonyl of the [PEG(y)]z group is part of an amide bond.
  • the terminal amine of the [PEG(y)]z group is part of an amide bond.
  • Ra or Rb is wherein x is 1-100, and w is 0-5.
  • x is 1-20. In some embodiments, x is 21-40. In some embodiments, x is 41-60. In some embodiments, x is 61-80. In some embodiments, x is 30-50. In some embodiments, x is 12, 24, 36 or 48.
  • w is 1. In some embodiments, w is 0.
  • Ra or Rb has the structure:
  • Ra or Rb is: wherein n is 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 1-30, 1-40, or 1-50.
  • Ra or Rb is: wherein n is 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 1-30, 1-40, or 1-50, x is 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 1-30, 1-40, or 1-50 and z is 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 1-30, 1-40, or 1-50.
  • Ra or Rb is: wherein x is 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 1-30, 1-40, or 1-50 and z is 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 1-30, 1-40, or 1-50.
  • Ra or Rb is: wherein n is 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 1-30, 1-40, or 1-50.
  • the solid line between A and B represents a nonpeptidyl linkage comprising the structure: wherein n is 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 1-30, 1-40, or 1-50, x is 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 1-30, 1-40, or 1-50 and z is 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 1-30, 1-40, or 1-50.
  • the solid line between A and B represents a nonpeptidyl linkage comprising the structure: wherein n is 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 1-30, 1-40, or 1-50, x is 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 1-30, 1-40, or 1-50 and x is 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 1-30, 1-40, or 1-50.
  • the present invention provides a process for producing a compound having the structure: A-B-----Z
  • the cysteine or selenocysteine naturally occurs in the stretch of consecutive amino acids. In some embodiments, the cysteine or selenocysteine does not naturally occur in the stretch of consecutive amino acids.
  • the F c domain of an antibody is a naturally occurring F c domain of an antibody.
  • the F c domain of an antibody is a variant F c domain of an antibody.
  • the variant F c domain of an antibody is a mutated F c domain of an antibody.
  • the mutated F c domain is a substitution mutant.
  • the substitution mutant has an amino acid substitution at the N-terminus, the C-terminus, or at a position of the F c domain other than the N-terminus or the C-terminus.
  • the substitution mutant has 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 10-15, 15-20, 10-20, or 20-50 amino acid sustitutions in the stretch of consecutive amino acids thereof.
  • the substitutions are conservative amino acid substitutions.
  • the mutated mutated F c domain is an amino acid addition mutant.
  • the amino acid addition mutant has 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 10-15, 15-20, 10-20, or 20-50 added amino acids in the stretch of consecutive amino acids thereof.
  • the mutated F c domain is an amino acid deletion mutant.
  • the amino acid deletion mutant has 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 10-15, 15-20, 10-20, or 20-50 deleted amino acids in the stretch of consecutive amino acids thereof.
  • the consecutive amino acids are identical to a stretch of at least 0, 20, 30, 40, 50, 60, 70, 80, 90, 100, 110, 120, 130, 140, 150, 160, 170, 180, or 190 consecutive amino acids present in the chain of the F c domain of the antibody.
  • the consecutive amino acids are identical to the stretch of amino acids in the hinge region, the CH2 region or the CH3 region of the Fc domain, or a portion thereof.
  • the solid line between A and B represents a nonpeptidyl linkage comprising the structure:
  • step d) is performed by first reacting A' and B' to produce ; wherein B" comprises B and the third terminal reactive group, and the solid line between B" and A represents a non-peptidyl linkage; and then reacting with C' to produce the compound.
  • step d) is performed by first reacting C' and B' to produce ; wherein B" comprises B and the second terminal reactive group, and the dashed line between B" and C represents a peptidyl linkage; and then reacting with A' to produce the compound.
  • the first terminal reactive group is an azide, a thiol, a nitrone or an alkyne.
  • the first terminal reactive group is an alkyne.
  • the alkyne is a cycloalkyne
  • the alkyne is an eight-membered ring.
  • the alkyne is an azacyclooctyne.
  • the cycloalkyne is a biarylazacyclooctyne.
  • the cycloalkyne is a cyclooctyne.
  • the alkyne is a terminal alkyne.
  • the first terminal reactive group is an azide, thiol or nitrone.
  • the first terminal reactive group is an azide.
  • the first terminal reactive group is a thiol.
  • the first terminal reactive group is a nitrone.
  • the first terminal reactive group is an N-alkyl nitrone.
  • the first terminal reactive group is an N-aryl nitrone.
  • the second terminal reactive group is an azide, a thiol, a nitrone or an alkyne.
  • the second terminal reactive group is an alkyne.
  • the alkyne is a cycloalkyne
  • the alkyne is an eight-membered ring.
  • the alkyne is an azacyclooctyne.
  • the cycloalkyne is a biarylazacyclooctyne.
  • the cycloalkyne is a cyclooctyne.
  • the alkyne is a terminal alkyne.
  • the second terminal reactive group is an azide, thiol or nitrone.
  • the second terminal reactive group is an azide.
  • the second terminal reactive group is a thiol.
  • the second terminal reactive group is a nitrone.
  • the second terminal reactive group is an N-alkyl nitrone.
  • the second terminal reactive group is an N-aryl nitrone.
  • the first terminal reactive group is a terminal alkyne and the second terminal reactive group is an azide, thiol or nitrone.
  • the second terminal reactive group is an azide.
  • the second terminal reactive group is a thiol.
  • the second terminal reactive group is a nitrone.
  • the nitrone is an N-alkyl or N-aryl nitrone.
  • the first terminal reactive group is an azide, thiol or nitrone
  • the second terminal reactive group is a terminal alkyne
  • the first terminal reactive group is an azide.
  • the first terminal reactive group is a thiol.
  • the first terminal reactive group is a nitrone.
  • the nitrone is an N-alkyl or N-aryl nitrone.
  • the first terminal reactive group is a cycloalkyne and the second terminal reactive group is an azide, thiol or nitrone.
  • the first terminal reactive group is an azide.
  • the first terminal reactive group is a thiol.
  • the first terminal reactive group is a nitrone.
  • the nitrone is an N-alkyl or N-aryl nitrone.
  • the first terminal reactive group is an azide, thiol or nitrone
  • the second terminal reactive group is a cycloalkyne
  • the first terminal reactive group is an azide.
  • the first terminal reactive group is a thiol.
  • the first terminal reactive group is a nitrone.
  • the nitrone is an N-alkyl or N-aryl nitrone.
  • the cycloalkyne is an eight-membered ring.
  • the cycloalkyne is an azacyclooctyne.
  • the cycloalkyne is a biarylazacyclooctyne.
  • the cycloalkyne is a cyclooctyne.
  • the first terminal reactive group is an azide and the second terminal reactive group is a terminal alkyne; or the first terminal reactive group is an azide and the second terminal reactive group is a cycloalkyne; or the first terminal reactive group is a thiol and the second terminal reactive group is a cycloalkyne; or the first terminal reactive group is a N-alkyl nitrone or N-aryl nitrone and the second terminal reactive group is a cyclooctyne.
  • the second terminal reactive group is an azide and the first terminal reactive group is a terminal alkyne; or the second terminal reactive group is an azide and the first terminal reactive group is a cycloalkyne; or the second terminal reactive group is a thiol and the first terminal reactive group is a cycloalkyne; or the second terminal reactive group is a N-alkyl nitrone or N-aryl nitrone and the first terminal reactive group is a cyclooctyne.
  • the first terminal reactive group and the second terminal reactive group react to produce a triazole, thiolene, N-alkyl isoxazoline or N-aryl isoxazoline.
  • the first terminal reactive group and the second terminal reactive group react to produce a triazole.
  • the first terminal reactive group and the second terminal reactive group react to produce a thiolene.
  • the first terminal reactive group and the second terminal reactive group react to produce a N-alkyl isoxazoline or N-aryl isoxazoline.
  • reacting the first reactive group with the second reactive group results in at least an 80%, 85% or 90% yield of the reaction in less than 3, 6, 12, 18, 24, 30, 36, 42, 48 or 72 hours.
  • the solid line between A and B represents a nonpeptidyl linkage comprising the structure:
  • the first terminal reactive group is a trans-cyclooctene or a tetrazine.
  • the first terminal reactive group is a trans-cyclooctene.
  • the alkyne is a tetrazine.
  • the second terminal reactive group is a trans-cyclooctene or a tetrazine.
  • the second terminal reactive group is a trans-cyclooctene.
  • the second terminal reactive group has the structure:
  • the second terminal reactive group has the structure:
  • the second terminal reactive group is a tetrazine.
  • the second terminal reactive group has the structure: wherein R c is H, alkyl or aryl.
  • the second terminal reactive group has the structure:
  • the first terminal reactive group is a trans-cyclooctene and the second terminal reactive group is a tetrazine.
  • the first terminal reactive group is a tetrazine and the second terminal reactive group is a trans-cyclooctene.
  • the first terminal reactive group and the second terminal reactive group react to produce a chemical structure containing a cyclooctane fused to a dihydropyridazine.
  • the first terminal reactive group and the second terminal reactive group react to produce the chemical structure:
  • the third reactive group and the fourth terminal reactive group are each independently an amino acid or amino acid derivative.
  • the third reactive group is a threonine or threonine derivative.
  • the third reactive group is a thioester derivative of an amino acid.
  • the fourth reactive group is cysteine, selenocysteine, homocysteine, or homoselenosysteine, or a derivative of cysteine, selenocysteine, homocysteine, or homoselenosysteine.
  • the fourth reactive group is cysteine or a derivative of cysteine.
  • the fourth reactive group is cysteine.
  • A' is prepared by the following steps:
  • theorganic structure containing an alkyne is N-propargyl amine.
  • A' is prepared by the following steps:
  • A" is prepared by the following steps:
  • the A′′′ is prepared by the following steps:
  • the monoclonal antibody binds TNF ⁇ .
  • the monoclonal antibody is adalimumab.
  • step d) B' is reacted in the presence of a metal catalyst.
  • step d) B' is reacted in the presence of a metal catalyst.
  • the metal catalyst is Ag(I) or Cu(I).
  • A' comprises one or more branched residue, wherein each branched residue comprises an additional first terminal reactive group.
  • B' comprises one or more branched residue, wherein each branched residue comprises an additional second terminal reactive group.
  • B' comprises one or more branched residue, wherein each branched residue comprises an additional third terminal reactive group.
  • the branched residue is an amino acid residue.
  • the amino acid residue is a lysine or a lysine derivative, arginine or an arginine derivative, aspartic acid or an aspartic acid derivative, glutamic acid or a glutamic acid derivative, asparagines or a asparagines derivative, glutamine or glutamine derivative, tyrosine or tyrosine derivative, cysteine or cysteine derivative or ornithine or ornithine derivative.
  • the amino acid residue is substituted at the N-position with a residue containing a terminal amino or carbony reactive group.
  • the branched residue is an organic residue containing two or more terminal amino groups or two or more terminal carbonyl groups.
  • the organic residue is iminodipropionic acid, iminodiacetic acid, 4-amino-pimelic acid, 4-amino-heptanedioic acid, 3-aminohexanedioic acid, 3-aminoadipic acid, 2-aminooctanedioic acid, or 2-amino-6-carbonyl-heptanedioic acid.
  • the process is performed in the absence of a non-thiol reducing agent.
  • the process is performed in the absence of a thiol reducing agent.
  • the process is performed in the presence of a thiol reducing agent.
  • the process is performed at an overall yield of 80% or higher.
  • the process is performed at an overall yield of 90% or higher.
  • reacting the first reactive group with the second reactive group results in at least a 50%, 55%, 60%, 65%, 70%, 80%, 85% or 90% yield of the reaction in less than 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, or 60 minutes.
  • B is an organic acid residue.
  • B is a stretch of 1-50 amino acid residues, and optionally, an organic acid residue.
  • B is a stretch of 1-10 consecutive amino acids.
  • B comprises a stretch of consecutive amino acids in the sequence, or a portion thereof, EPKSCDKTHTCPPCP, ERKCCVECPPCP, ELKTPLGDTTHTCPRCP(EPKSCDTPPPCPRCP)3, ESKYGPPCPSCP.
  • B has a threonine at its C-terminus.
  • C is a first polypeptide, which first popyleptide comprises consecutive amino acids which (i) are identical to a stretch of consecutive amino acids present in a chain of an F c domain of an antibody; (ii) bind to an F c receptor; and (iii) have at their N-terminus a sequence selected from the group consisting of a cysteine, selenocysteine, CP,
  • C is a polypeptide component of the compound, which polypeptide component comprises consecutive amino acids which (i) are identical to a stretch of consecutive amino acids present in a chain of an F c domain of an antibody; (ii) bind to an F c receptor; and (iii) have at their N-terminus a sequence comprising a non-naturally occurring cysteine or selenocysteine.
  • C comprises consecutive amino acids which are identical to a stretch of consecutive amino acids present in the chain of an Fc domain of an antibody selected from the group consisting of IgG, IgM, IgA, IgD, and IgE.
  • C comprises consecutive amino acids which are identical to a stretch of consecutive amino acids present in the chain of an Fc6 domain of an antibody.
  • C further comprises consecutive amino acids which are identical to a stretch of consecutive amino acids present in a chain of an antibody other than a chain of a Fc domain of the antibody.
  • C comprises consecutive amino acids which are identical to a stretch of consecutive amino acids present in a heavy chain of a Fab or a Fab' of an antibody.
  • C comprises consecutive amino acids which are identical to a stretch of consecutive amino acids present in the light chain of a Fab or a Fab' of an antibody.
  • Z further comprises a second polypeptide, which second popyleptide comprises consecutive amino acids which are identical to a stretch of consecutive amino acids present in a chain of an antibody other than a chain of a Fc domain of the antibody.
  • the second popypeptide comprises consecutive amino acids which are identical to a stretch of consecutive amino acids present in a heavy chain of a Fab or a Fab' of an antibody.
  • the second popypeptide comprises consecutive amino acids which are identical to a stretch of consecutive amino acids present in the light chain of a Fab or a Fab' of an antibody.
  • Z comprises an antibody or a portion thereof.
  • Z comprises at least one Fab or Fab' of an antibody, or a portion of the at least one Fab or Fab'.
  • Z comprises at least 2, 3, 4, 5, 6, 7, 8, 9, or 10 copies of the Fab or Fab' or portion thereof.
  • Z comprises Fab-1 or Fab'1, or a portion thereof of an antibody.
  • Z comprises Fab-2 or Fab'2, or a portion thereof of an antibody.
  • Z comprises two Fab or Fab' hands of an antibody.
  • the antibody is an IgG, IgM, IgA, IgD or IgE antibody.
  • the Fab or Fab' is present in adalimumab.
  • Z comprises at least one stretch of consecutive amino acids which are identical to a stretch of consecutive amino acids present in a single chain antibody.
  • the C-terminus of C comprises a stretch of consecutive amino acids present in a chain of an F c domain of an antibody that has been modified.
  • the C-terminus of C is a cysteine, selenocysteine, homocysteine, or homoselenosysteine, or a derivative of cysteine, selenocysteine, homocysteine, or homoselenosysteine.
  • B is linked to Z via a peptidyl linkage between an N-terminal cysteine or selenocysteine of a polypeptide of Z and an amino acid residue or an organic acid residue of B.
  • Z comprises a second polypeptide
  • B is linked to Z via a peptidyl linkage between the N-terminal cysteine or selenocysteine of the second polypeptide of Z and an amino acid residue or an organic acid residue of B.
  • B is linked to C via a peptidyl linkage between the N-terminal cysteine or selenocysteine of C and an amino acid residue or an organic acid residue of B.
  • Z comprises one polypeptide, which is C.
  • Z comprises two polypeptides, which are C and a second polypeptide.
  • the present invention provides homodimers and heterodimers comprising compounds of the invention.
  • each compound of the dimer is capable of binding to the other by at least one disulfide bond.
  • each compound of the dimer is capable of binding to the other by at least one disulfide bond between the C or the second polypeptide of each compound.
  • each compound of the dimer is bound to the other by at least one disulfide bond.
  • each compound of the dimer is bound to the other by at least one disulfide bond between the C or the second polypeptide of each compound.
  • each compound of the dimer is non-covalently bound to the other.
  • the dimer is:
  • the branched residue is a lysine or a lysine derivative, arginine or an arginine derivative, aspartic acid or an aspartic acid derivative, glutamic acid or a glutamic acid derivative, asparagines or a asparagines derivative, glutamine or glutamine derivative, tyrosine or tyrosine derivative, cysteine or cysteine derivative or ornithine or ornithine derivative.
  • the branched residue is an amino acid substituted at the N-position with a residue containing a terminal amino or carbonyl reactive group. In some embodiments, the branched residue is an organic residue containing two or more terminal amino groups or two or more terminal carbonyl groups.
  • the branched residue is an organic residue containing two or more terminal amino groups. In some embodiments, the branched residue is an organic residue containing two or more terminal carbonyl groups. In some embodiments, the branched residue is a diaminopropionic acid. In some embodiments, the branched residue is a diaminopropionic carbonyl compound.
  • the branched residue is 4-(carbonylmethoxy)phenylalanine, 2-amino-6-(carbonylmethylamino)hexanoic acid, S-(carbonylpropyl)cysteine, S-(carbonylethyl)cysteine, S-(carbonylmethyl)cysteine, N-(carbonylethyl)glycine, N-(carbonylmethyl)glycine, iminodipropionic acid, iminodiacetic acid, 4-amino-pimelic acid, 4-amino-heptanedioic acid, 3-aminohexanedioic acid, 3-aminoadipic acid, 2-aminooctanedioic acid, or 2-amino-6-carbonyl-heptanedioic acid.
  • the branched residue is prepared from Fmoc-L-Asp-AMC, Fmoc-L-Asp-pNA, Fmoc-L-Glu-AMC, Fmoc-L-Glu-pNA, Fmoc-L-Glu(Edans)-OH, Fmoc-L-Glu(PEG-biotinyl)-OH, (S)-Fmoc-2-amino-hexanedioic acid-6-tert-butyl ester, (S)-Fmoc-2-aminoadipic acid-6-tert-butyl ester, (S)-Fmoc-Aad(OtBu)-OH, (S)-Fmoc-2-amino-5-tert-butoxycarbonyl-hexanedioic acid-6-tert-butyl ester, (S)-Fmoc-2-amino-heptanedioic acid-7-tert
  • the branched residue is prepared from N- ⁇ -Boc-DL-diaminopropionic acid, N- ⁇ -Boc-D-diaminopropionic acid, N- ⁇ -Boc-L-diaminopropionic acid, N- ⁇ -Fmoc-L-diaminopropionic acid, N- ⁇ -Boc-N- ⁇ -Alloc-D-diaminopropionic acid, N- ⁇ -Boc-N- ⁇ -Alloc-L-diaminopropionic acid, N- ⁇ -Fmoc-N- ⁇ -alloc-L-diaminopropionic acid, N- ⁇ -N- ⁇ -Bis-Boc-L-diaminopropionic acid, N- ⁇ -Fmoc-N- ⁇ -Boc-D-diaminopropionic acid, N- ⁇ -Fmoc-N- ⁇ -Boc-L-diaminoprop
  • 0.2-5 mg/kg/day is a disclosure of 0.2 mg/kg/day, 0.3 mg/kg/day, 0.4 mg/kg/day, 0.5 mg/kg/day, 0.6 mg/kg/day etc. up to 5.0 mg/kg/day.
  • Peptidyl linkage the structure .
  • a peptidyl linkage may be a peptide bond.
  • Stretch of consecutive amino acids a plurality of amino acids arranged in a chain, each of which is joined to a preceding amino acid by a peptide bond, excepting that the first amino acid in the chain may optionally not be joined to a preceding amino acid.
  • the amino acids of the chain may be naturally or non-naturally occurring, or may comprise a mixture thereof.
  • the amino acids, unless otherwise indicated, may be genetically encoded, naturally-occurring but not genetically encoded, or non-naturally occurring, and any selection thereof.
  • N-terminal amino acid residue the terminal residue of a stretch of two or more consecutive amono acids having a free ⁇ -amino (NH 2 ) functional group, or a derivative of an ⁇ -amino (NH 2 ) functional group.
  • N-terminus the free ⁇ -amino (NH 2 ) group (or derivative thereof) of a N-terminal amino acid residue.
  • C-terminal amino acid residue the terminal residue of a stretch of two or more consecutive amono acids having a free ⁇ -carboxyl (COOH) functional group, or a derivative of a ⁇ - carboxyl (COOH) functional group.
  • C-terminus the free ⁇ -carboxyl (COOH) group (or derivative thereof) of a C-terminal amino acid residue.
  • a “biologically active structure”, as used herein, means a structure of a molecule or fragment thereof, capable of treating a disease or condition or localizing or targeting a compound of the invention to a site of a disease or condition in the body by performing a function or an action, or stimulating or responding to a function, an action or a reaction, in a biological context (e.g. in an organism, a cell, or an in vitro model thereof).
  • Biologically active structures may comprise a structure of at least one of polypeptides, nucleic acids, small molecules such as small organic or inorganic molecules.
  • a “bond”, unless otherwise specified, or contrary to context, is understood to include a covalent bond, a dipole-dipole interaction such as a hydrogen bond, and intermolecular interactions such as van der Waals forces.
  • a “Signal Sequence” is a short (3-60 amino acids long) peptide chain that directs the post-translational transport of a polypeptide.
  • amino acid as used herein, in one embodiment, means a L or D isomer of the genetically encoded amino acids, i.e. isoleucine, alanine, leucine, asparagine, lysine, aspartate, methionine, cysteine, phenylalanine, glutamate, threonine, glutamine, tryptophan, glycine, valine, proline, arginine, serine, histidine, tyrosine, selenocysteine, pyrrolysine and also includes homocysteine and homoselenocysteine.
  • amino acids i.e. isoleucine, alanine, leucine, asparagine, lysine, aspartate, methionine, cysteine, phenylalanine, glutamate, threonine, glutamine, tryptophan, glycine, valine, proline, arginine, serine, histidine, t
  • amino acids include an L or D isomer of taurine, gaba, dopamine, lanthionine, 2-aminoisobutyric acid, dehydroalanine, ornithine and citrulline, as well as non-natural homologues and synthetically modified forms thereof including amino acids having alkylene chains shortened or lengthened by up to two carbon atoms, amino acids comprising optionally substituted aryl groups, and amino acids comprising halogenated groups, including halogenated alkyl and aryl groups as well as beta or gamma amino acids, and cyclic analogs.
  • the amino acids in these embodiments may be in the form of acidic or basic salts, or may be in neutral forms. Individual amino acid residues may also be modified by oxidation or reduction. Other contemplated modifications include hydroxylation of proline and lysine, phosphorylation of hydroxyl groups of seryl or threonyl residues, and methylation of the alpha-amino groups of lysine, arginine, and histidine side chains.
  • Covalent derivatives may be prepared by linking particular functional groups to the amino acid side chains or at the Nor C-termini.
  • Natural amino acid as used herein means a L or D isomer of the genetically encoded amino acids, i.e. isoleucine, alanine, leucine, asparagine, lysine, aspartate, methionine, cysteine, phenylalanine, glutamate, threonine, glutamine, tryptophan, glycine, valine, proline, arginine, serine, histidine, tyrosine, selenocysteine, pyrrolysine and homocysteine and homoselenocysteine.
  • Non-natural amino acid as used herein means a chemically modified L or D isomer of isoleucine, alanine, leucine, asparagine, lysine, aspartate, methionine, cysteine, phenylalanine, glutamate, threonine, glutamine, tryptophan, glycine, valine, proline, arginine, serine, histidine, tyrosine, selenocysteine, pyrrolysine, homocysteine, homoselenocysteine, taurine, gaba, dopamine, lanthionine, 2-aminoisobutyric acid, dehydroalanine, ornithine or citrulline, including cysteine and selenocysteine derivatives having C 3 -C 10 aliphatic side chains between the alpha carbon and the S or Se.
  • the aliphatic side chain is an alkylene.
  • the aliphatic side chain is
  • variants thereof can be prepared by introducing appropriate nucleotide changes into the encoding DNA, and/or by synthesis of the desired consecutive amino acid sequences.
  • amino acid changes may alter post-translational processes of the stretches of consecutive amino acids described herein when expression is the chosen method of synthesis (rather than chemical synthesis for example), such as changing the number or position of glycosylation sites or altering the membrane anchoring characteristics.
  • Variations in the sequences described herein can be made, for example, using any of the techniques and guidelines for conservative and non-conservative mutations set forth, for instance, in U.S. Pat. No. 5,364,934 .
  • Variations may be a substitution, deletion or insertion of one or more codons encoding the consecutive amino acid sequence of interest that results in a change in the amino acid sequence as compared with the native sequence.
  • the variation is by substitution of at least one amino acid with any other amino acid in one or more of the domains.
  • Guidance in determining which amino acid residue may be inserted, substituted or deleted without adversely affecting the desired activity may be found by comparing the sequence with that of homologous known protein molecules and minimizing the number of amino acid sequence changes made in regions of high homology.
  • Amino acid substitutions can be the result of replacing one amino acid with another amino acid having similar structural and/or chemical properties, such as the replacement of a leucine with a serine, i.e., conservative amino acid replacements.
  • Insertions or deletions may optionally be in the range of about 1 to 5 amino acids. The variation allowed may be determined by systematically making insertions, deletions or substitutions of amino acids in the sequence and testing the resulting variants for activity exhibited by the full-length or mature native sequence. It is understood that any terminal variations are made within the context of the invention disclosed herein.
  • Amino acid sequence variants of the binding partner are prepared with various objectives in mind, including increasing the affinity of the binding partner for its ligand, facilitating the stability, purification and preparation of the binding partner, modifying its plasma half life, improving therapeutic efficacy, and lessening the severity or occurrence of side effects during therapeutic use of the binding partner.
  • Amino acid sequence variants of these sequences are also contemplated herein including insertional, substitutional, or deletional variants.
  • Such variants ordinarily can prepared by site-specific mutagenesis of nucleotides in the DNA encoding the target-binding monomer, by which DNA encoding the variant is obtained, and thereafter expressing the DNA in recombinant cell culture. Fragments having up to about 100-150 amino acid residues can also be prepared conveniently by in vitro synthesis.
  • Such amino acid sequence variants are predetermined variants and are not found in nature. The variants exhibit the qualitative biological activity (including target-binding) of the nonvariant form, though not necessarily of the same quantative value.
  • the mutation per se need not be predetermined.
  • random or saturation mutagenesis (where all 20 possible residues are inserted) is conducted at the target codon and the expressed variant is screened for the optimal combination of desired activities. Such screening is within the ordinary skill in the art.
  • Amino acid insertions usually will be on the order of about from 1 to 10 amino acid residues; substitutions are typically introduced for single residues; and deletions will range about from 1 to 30 residues. Deletions or insertions preferably are made in adjacent pairs, i.e. a deletion of 2 residues or insertion of 2 residues. It will be amply apparent from the following discussion that substitutions, deletions, insertions or any combination thereof are introduced or combined to arrive at a final construct.
  • the invention concerns a compound comprising a stretch of consecutive amino acids having at least about 80% sequence identity, preferably at least about 81% sequence identity, more preferably at least about 82% sequence identity, yet more preferably at least about 83% sequence identity, yet more preferably at least about 84% sequence identity, yet more preferably at least about 85% sequence identity, yet more preferably at least about 86% sequence identity, yet more preferably at least about 87% sequence identity, yet more preferably at least about 88% sequence identity, yet more preferably at least about 89% sequence identity, yet more preferably at least about 90% sequence identity, yet more preferably at least about 91% sequence identity, yet more preferably at least about 92% sequence identity, yet more preferably at least about 93% sequence identity, yet more preferably at least about 94% sequence identity, yet more preferably at least about 95% sequence identity, yet more preferably at least about 96% sequence identity, yet more preferably at least about 97% sequence identity, yet more preferably at least about 98% sequence identity and yet more preferably at least about 99% sequence identity to an amino acid
  • % amino acid sequence identity values can be readily obtained using, for example, the WU-BLAST-2 computer program ( Altschul et al., Methods in Enzymology 266:460-480 (1996 )).
  • fragments of native sequences are provided herein. Such fragments may be truncated at the N-terminus or C-terminus, or may lack internal residues, for example, when compared with a full length native protein. Again, it is understood that any terminal variations are made within the context of the invention disclosed herein.
  • Certain fragments lack amino acid residues that are not essential for a desired biological activity of the sequence of interest.
  • Desired peptide fragments or fragments of stretches of consecutive amino acids may be chemically synthesized.
  • An alternative approach involves generating fragments by enzymatic digestion, e.g. by treating the protein with an enzyme known to cleave proteins at sites defined by particular amino acid residues, or by digesting the DNA with suitable restriction enzymes and isolating the desired fragment.
  • Yet another suitable technique involves isolating and amplifying a DNA fragment encoding a desired polypeptide/sequence fragment, by polymerase chain reaction (PCR). Oligonucleotides that define the desired termini of the DNA fragment are employed at the 5' and 3' primers in the PCR.
  • conservative substitutions of interest are shown in Table 1 under the heading of preferred substitutions. If such substitutions result in a change in biological activity, then more substantial changes, denominated exemplary substitutions in Table 1, or as further described below in reference to amino acid classes, are introduced and the products screened.
  • Substantial modifications in function or immunological identity of the sequence are accomplished by selecting substitutions that differ significantly in their effect on maintaining (a) the structure of the polypeptide backbone in the area of the substitution, for example, as a sheet or helical conformation, (b) the charge or hydrophobicity of the molecule at the target site, or (c) the bulk of the side chain.
  • Naturally occurring residues are divided into groups based on common side-chain properties:
  • Non-conservative substitutions will entail exchanging a member of one of these classes for another class. Such substituted residues also may be introduced into the conservative substitution sites or, more preferably, into the remaining (non-conserved) sites.
  • the variations can be made using methods known in the art such as oligonucleotide-mediated (site-directed) mutagenesis, alanine scanning, and PCR mutagenesis.
  • Site-directed mutagenesis Carter et al., Nucl. Acids Res., 13:4331 (1986 ); Zoller et al., Nucl. Acids Res., 10:6487 (1987 )
  • cassette mutagenesis Wells et al., Gene, 34:315 (1985 )
  • restriction selection mutagenesis Wells et al., Philos. Trans. R. Soc. London SerA, 317:415 (1986 )
  • other known techniques can be performed on the cloned DNA to produce the variant DNA.
  • Scanning amino acid analysis can also be employed to identify one or more amino acids along a contiguous sequence.
  • preferred scanning amino acids are relatively small, neutral amino acids.
  • Such amino acids include alanine, glycine, serine, and cysteine.
  • Alanine is typically a preferred scanning amino acid among this group because it eliminates the side-chain beyond the beta-carbon and is less likely to alter the main-chain conformation of the variant ( Cunningham and Wells, Science, 244:1081-1085 (1989 )). Alanine is also typically preferred because it is the most common amino acid. Further, it is frequently found in both buried and exposed positions (Creighton, The Proteins, (W.H. Freeman & Co., N.Y.); Chothia, J. Mol. Biol., 150:1 (1976 )). If alanine substitution does not yield adequate amounts of variant, an isoteric amino acid can be used.
  • Covalent modifications The stretch of consecutive amino acids may be covalently modified.
  • One type of covalent modification includes reacting targeted amino acid residues with an organic derivatizing agent that is capable of reacting with selected side chains or the N- or C-terminal residues that are not involved in an -x-x- bond.
  • Derivatization with bifunctional agents is useful, for instance, for crosslinking to a water-insoluble support matrix or surface for use in the method for purifying anti-sequence of interest antibodies, and vice-versa.
  • crosslinking agents include, e.g., 1,1-bis(diazoacetyl)-2-phenylethane, glutaraldehyde, N-hydroxysuccinimide esters, for example, esters with 4-azidosalicylic acid, homobifunctional imidoesters, including disuccinimidyl esters such as 3,3'-dithiobis(succinimidylpropionate), bifunctional maleimides such as bis-N-maleimido-1,8-octane and agents such as methyl-3-((p-azidophenyl)dithio)propioimidate.
  • 1,1-bis(diazoacetyl)-2-phenylethane glutaraldehyde
  • N-hydroxysuccinimide esters for example, esters with 4-azidosalicylic acid
  • homobifunctional imidoesters including disuccinimidyl esters such as 3,3'-dithiobis(s
  • Another type of covalent modification comprises altering the native glycosylation pattern of the stretch of consecutive amino acids.
  • "Altering the native glycosylation pattern” is intended for purposes herein to mean deleting one or more carbohydrate moieties found in amino acid sequences (either by removing the underlying glycosylation site or by deleting the glycosylation by chemical and/or enzymatic means), and/or adding one or more glycosylation sites that are not present in the native sequence.
  • the phrase includes qualitative changes in the glycosylation of the native proteins, involving a change in the nature and proportions of the various carbohydrate moieties present.
  • Addition of glycosylation sites to the amino acid sequence may be accomplished by altering the amino acid sequence.
  • the alteration may be made, for example, by the addition of, or substitution by, one or more serine or threonine residues to the native sequence (for O-linked glycosylation sites).
  • the amino acid sequence may optionally be altered through changes at the DNA level, particularly by mutating the DNA encoding the amino acid sequence at preselected bases such that codons are generated that will translate into the desired amino acids.
  • Another means of increasing the number of carbohydrate moieties on the amino acid sequence is by chemical or enzymatic coupling of glycosides to the polypeptide. Such methods are described in the art, e.g., in WO 87/05330 published Sep. 11, 1987 , and in Aplin and Wriston, CRC Crit. Rev. Biochem., pp. 259-306 (1981 ).
  • Removal of carbohydrate moieties present on the amino acid sequence may be accomplished chemically or enzymatically or by mutational substitution of codons encoding for amino acid residues that serve as targets for glycosylation.
  • Chemical deglycosylation techniques are known in the art and described, for instance, by Hakimuddin, et al., Arch. Biochem. Biophys., 259:52 (1987 ) and by Edge et al., Anal. Biochem., 118:131 (1981 ).
  • Enzymatic cleavage of carbohydrate moieties on polypeptides can be achieved by the use of a variety of endo- and exo-glycosidases as described by Thotakura et al., Meth. Enzymol., 138:350 (1987 ).
  • Another type of covalent modification comprises linking the amino acid sequence to one of a variety of nonproteinaceous polymers, e.g., polyethylene glycol (PEG), polypropylene glycol, or polyoxyalkylenes, in the manner set forth in U.S. Pat. Nos. 4,640,835 ; 4,496,689 ; 4,301,144 ; 4,670,417 ; 4,791,192 or 4,179,337 .
  • PEG polyethylene glycol
  • polypropylene glycol polypropylene glycol
  • polyoxyalkylenes polyoxyalkylenes
  • substitution refers to a functional group in which one or more bonds to a hydrogen atom contained therein are replaced by a bond to non-hydrogen atoms, provided that normal valencies are maintained and that the substitution results in a stable compound.
  • Substituted groups also include groups in which one or more bonds to a carbon(s) or hydrogen (s) atom are replaced by one or more bonds, including double or triple bonds, to a heteroatom.
  • substituent groups include halogens (i.e., F, Cl, Br, and I); alkyl groups, such as methyl, ethyl, n-propyl, isopropryl, n-butyl, tert-butyl, and trifluoromethyl; aryl groups, such as phenyl; heteroaryl groups, such as triazole, dihydropyridazine and tetrazole; hydroxyl; alkoxy groups, such as methoxy, ethoxy, n-propoxy, and isopropoxy; aryloxy groups, such as phenoxy; arylalkyloxy, such as benzyloxy (phenylmethoxy) and p-trifluoromethylbenzyloxy (4-trifluoromethylphenylmethoxy); heteroaryloxy groups; sulfonyl groups, such as sulfonate, trifluoromethanesulfonyl, methanesulfonyl
  • the substituted compound can be independently substituted by one or more of the disclosed or claimed substituent moieties, singly or plurally.
  • independently substituted it is meant that the (two or more) substituents can be the same or different.
  • alkyl, heteroalkyl, monocycle, bicycle, aryl, heteroaryl and heterocycle groups can be substituted by replacing one or more hydrogen atoms with alternative non-hydrogen groups. These include, but are not limited to, halo, hydroxy, mercapto, amino, carboxy, cyano and carbamoyl.
  • substituents and substitution patterns on the compounds used in the method of the present invention can be selected by one of ordinary skill in the art to provide compounds that are chemically stable and that can be readily synthesized by techniques known in the art from readily available starting materials. If a substituent is itself substituted with more than one group, it is understood that these multiple groups may be on the same carbon or on different carbons, so long as a stable structure results.
  • alkyl includes both branched and straight-chain saturated aliphatic hydrocarbon groups having the specified number of carbon atoms and may be unsubstituted or substituted.
  • C 1 -C n as in “C 1 -C n alkyl” is defined to include groups having 1, 2, ...., n-1 or n carbons in a linear or branched arrangement.
  • C 1 -C 6 is defined to include groups having 1, 2, 3, 4, 5, or 6 carbons in a linear or branched arrangement, and specifically includes methyl, ethyl, n-propyl, isopropyl, n-butyl, t-butyl, pentyl, and hexyl. Unless otherwise specified contains one to twelve carbons.
  • Alkyl groups can be unsubstituted or substituted with one or more substituents, including but not limited to halogen, alkoxy, alkylthio, trifluoromethyl, difluoromethyl, methoxy, and hydroxyl.
  • An embodiment can be C 1 -C 12 alkyl, C 2 -C 12 alkyl, C 3 -C 12 alkyl, C 4 -C 12 alkyl and so on.
  • An embodiment can be C 1 -C 8 alkyl, C 2 -C 8 alkyl, C 3 -C 8 alkyl, C 4 -C 8 alkyl and so on.
  • Alkyl is intended to include moieties that are monovalent, divalent, trivalent, etc.
  • C 1 -C 4 alkyl includes both branched and straight-chain C 1 -C 4 alkyl.
  • cycloalkane refers to a monocyclic or bicyclic ring system, which may be unsaturated or partially unsaturated, i.e. possesses one or more double bonds.
  • Monocyclic ring systems are exemplified by a saturated cyclic hydrocarbon group containing from 3 to 8 carbon atoms. Examples of monocyclic ring systems include cyclopropyl, cyclobutyl, cyclopentyl, cyclopentenyl, cyclohexyl, cyclohexenyl, cycloheptyl and cyclooctyl.
  • Bicyclic fused ring systems are exemplified by a cycloalkyl ring fused to another cycloalkyl ring.
  • Examples of bicyclic fused ring systems include, but are not limited to, decalin, 1,2,3,7,8,8a-hexahydro-naphthalene, and the like.
  • C 3 -C 10 cycloalkane includes cyclic rings of alkanes of three to eight total carbon atoms, (e.g., cyclopropyl, cyclobutyl, cyclopentyl, cyclohexyl, cycloheptyl or cyclooctyl and so on).
  • Cycloalkane groups can be unsubstituted or substituted with one or more substituents, including but not limited to halogen, alkoxy, alkylthio, trifluoromethyl, difluoromethyl, methoxy, and hydroxyl. Cycloalkane is intended to include moieties that are monovalent, divalent, trivalent, etc.
  • cycloalkene refers to a cycloalkane which possesses one or more double bonds.
  • C 5 -C 10 cycloalkene includes cyclic rings of alkanes of five to ten total carbon atoms, (e.g., cyclopentenyl, cyclohexenyl, cycloheptenyl, cyclohexadienyl, cyclooctenyl or cyclooctadienyl and so on).
  • Cycloalkene is intended to moieties that are monovalent, divalent, trivalent, etc.
  • Cycloalkene is intended to include moieties that are monovalent, divalent, trivalent, etc.
  • alkene includes both branched and straight-chain aliphatic hydrocarbon groups having one or more double bond and the specified number of carbon atoms and may be unsubstituted or substituted.
  • C 2 -C n as in “C2-C n alkene” is defined to include groups having 2, 3, ...., n-1 or n carbons in a linear or branched arrangement.
  • C 2 -C 10 , as in “C 2 -C 10 alkene” is defined to include groups having 2, 3, 4, 5...10 carbons in a linear or branched arrangement, and specifically includes vinyl, allyl, 1-butene, 2-butene, isobutene, 1-pentene, 2-pentene, etc.
  • Alkyene groups can be unsubstituted or substituted with one or more substituents, including but not limited to halogen, alkoxy, alkylthio, trifluoromethyl, difluoromethyl, methoxy, and hydroxyl.
  • An embodiment can be C 2 -C 3 alkene, C 2 -C 4 alkene, C 2 -C 5 alkene, and so on.
  • Alkene is intended to include moieties that are monovalent, divalent, trivalent, etc.
  • an "acyl” refers to an alkyl group having a ketone at the first position.
  • an “acyl” embodiment can be acetyl, propionyl, butyryl and valeryl.
  • an “acyl” embodiment can be: ,wherein n is 1-10. In another embodiment, n is 1-4.
  • a "C 2 -C 5 acyl” can be acetyl, propionyl, butyryl, or and valeryl.
  • Acyl is intended to include moieties that are monovalent, divalent, trivalent, etc.
  • C 2 -C 5 acylamino is an acyl group as defined above further substituted with an amine.
  • the amine may be linked to the carbonyl portion of the acyl group so as to form an amide or the amine may linked to a non-carbonyl portion of the acyl group.
  • the amino group may be at the alpha-position, the beta-position, the gamma-position, the delta-position, etc.
  • acylamino includes both alpha-aminoacetyl and acetamido groups.
  • Acylamino includes beta-aminopropionyl).
  • C 2 -C 5 acyloxy is an acyl group as defined above further substituted with an oxygen.
  • the oxygen may be linked to the carbonyl portion of the acyl group so as to form an amide or the oxygen may linked to a non-carbonyl portion of the acyl group.
  • the oxygen group may be at the alpha-position, the beta-position, the gamma-position, the delta-position, etc.
  • acyloxy includes both alpha-oxyacetyl and acetate groups.
  • Acyloxy includes beta-oxypropionyl).
  • amino includes primary, secondary, tertiary and quarternary amines.
  • amino includes a -NH- group, a - NH 2 group, a -NR- group, a -NR 2 + - group, a -NRH + - group, a -NH 2 + -group, a -NH 3 + group and a -NR 3 + group, wherein R is alkyl or aryl.
  • Amino is intended to include moieties that are monovalent, divalent, trivalent, etc.
  • sulfur includes a -S- group and a -SH group.
  • the term sulfur is intended to include moieties that are monovalent, divalent, trivalent, etc.
  • oxygen includes a -O- group and a -OH group.
  • sulfur is intended to moieties that are monovalent and divalent.
  • succinyl is derived from succinic acid by removal of one or both hydroxyl groups.
  • An embodiment can be - C(O)-CH 2 -CH 2 -C(O)-.
  • Succinyl is intended to include moieties that are monovalent, divalent, trivalent, etc.
  • a "malonyl” is derived from malonic acid by removal of one or both hydroxyl groups.
  • An embodiment can be - C(O)-CH 2 -C(O)-.
  • Malonyl is intended to include moieties that are monovalent, divalent, trivalent, etc.
  • a "glutaryl” is derived from glutaric acid by removal of one or both hydroxyl groups.
  • An embodiment can be - C(O)-CH 2 -CH 2 -CH 2 -C(O)-.
  • Glutaryl is intended to include moieties that are monovalent, divalent, trivalent, etc.
  • an "adipoyl” is derived from adipic acid by removal of one or both hydroxyl groups.
  • An embodiment can be - C(O)-CH 2 -CH 2 -CH 2 -CH 2 -(O)-.
  • Adipoyl is intended to include moieties that are monovalent, divalent, trivalent, etc.
  • polyalkylene glycol is derived from polyalkylene glycol by removal of both hydrogens from the hydroxyl groups.
  • An embodiment can be derived from polyethylene glycol, polypropylene glycol, or polybutylene glycol.
  • An "polyalkylene glycol” embodiment can be or wherein n is 1-10.
  • aryl is intended to mean any stable monocyclic, bicyclic or polycyclic carbon ring of up to 10 atoms in each ring, wherein at least one ring is aromatic, and may be unsubstituted or substituted.
  • aryl elements include but are not limited to: phenyl, p-toluenyl (4-methylphenyl), naphthyl, tetrahydro-naphthyl, indanyl, phenanthryl, anthryl or acenaphthyl.
  • the aryl substituent is bicyclic and one ring is non-aromatic, it is understood that attachment is via the aromatic ring.
  • aryl is intended to mean any stable monocyclic, bicyclic or polycyclic carbon ring of up to 10 atoms in each ring, wherein at least one ring is aromatic, and may be unsubstituted or substituted.
  • aryl elements include but are not limited to: phenyl, p-toluenyl (4-methylphenyl), naphthyl, tetrahydro-naphthyl, indanyl, phenanthryl, anthryl or acenaphthyl.
  • the aryl substituent is bicyclic and one ring is non-aromatic, it is understood that attachment is via the aromatic ring.
  • heteroaryl represents a stable monocyclic, bicyclic or polycyclic ring of up to 10 atoms in each ring, wherein at least one ring is aromatic and contains from 1 to 4 heteroatoms selected from the group consisting of O, N and S.
  • Bicyclic aromatic heteroaryl groups include phenyl, pyridine, pyrimidine or pyridizine rings that are (a) fused to a 6-membered aromatic (unsaturated) heterocyclic ring having one nitrogen atom; (b) fused to a 5- or 6-membered aromatic (unsaturated) heterocyclic ring having two nitrogen atoms; (c) fused to a 5-membered aromatic (unsaturated) heterocyclic ring having one nitrogen atom together with either one oxygen or one sulfur atom; or (d) fused to a 5-membered aromatic (unsaturated) heterocyclic ring having one heteroatom selected from O, N or S.
  • Heteroaryl groups within the scope of this definition include but are not limited to: benzoimidazolyl, benzofuranyl, benzofurazanyl, benzopyrazolyl, benzotriazolyl, benzothiophenyl, benzoxazolyl, carbazolyl, carbolinyl, cinnolinyl, dihydropyridizine, furanyl, indolinyl, indolyl, indolazinyl, indazolyl, isobenzofuranyl, isoindolyl, isoquinolyl, isothiazolyl, isoxazolyl, naphthpyridinyl, oxadiazolyl, oxazolyl, oxazoline, isoxazoline, oxetanyl, pyranyl, pyrazinyl, pyrazolyl, pyridazinyl, pyridopyridinyl, pyridazinyl
  • heteroaryl substituent is bicyclic and one ring is non-aromatic or contains no heteroatoms, it is understood that attachment is via the aromatic ring or via the heteroatom containing ring, respectively. If the heteroaryl contains nitrogen atoms, it is understood that the corresponding N-oxides thereof are also encompassed by this definition.
  • phenyl is intended to mean an aromatic six membered ring containing six carbons, and any substituted derivative thereof.
  • benzyl is intended to mean a methylene attached directly to a benzene ring.
  • a benzyl group is a methyl group wherein a hydrogen is replaced with a phenyl group, and any substituted derivative thereof.
  • triazole is intended to mean a heteraryl having a five-membered ring containing two carbon atoms and three nitrogen atoms, and any substituted derivative thereof.
  • Dihydropyradizine is optionally substituted and includes 1,2-dihydropyridazines, 1,4-dihydropyridazines, 1,6-dihydropyridazines, and 4,5-dihydropyridazines,
  • a chemical structure containing a cyclooctane fused to a dihydropyridazine includes, but is not limited to, a chemical structure which contains a cyclooctane fused to the 3rd and 4th position of a dihydropyridazine or a chemical structure which contains a saturated cycloocta[d]pyridazine, any of which are optionally substituted.
  • the chemical structure containing a cyclooctane fused to a dihydropyridazine includes, but is not limited to, a chemical structure which contains a 2,4a,5,6,7,8,9,10-octahydrocycloocta[d]pyridazine, ; a 4a,5,6,7,8,9,10,10a-octahydrocycloocta[d]pyridazine, ; a 2,3,5,6,7,8,9,10-octahydrocycloocta[d]pyridazine, ; or a 1,2,5,6,7,8,9,10-octahydrocycloocta[d]pyridazine, each of which may be optionally substituted.
  • Tautomers of include, but are not limited to:
  • the dihydropyridazine is oxidized to a pyridazine.
  • the dihydropyridazine is reduced to result in an open ring structure having a 1,4-dicarbonyl compound.
  • the compounds used in the method of the present invention may be prepared by techniques well know in organic synthesis and familiar to a practitioner ordinarily skilled in the art. However, these may not be the only means by which to synthesize or obtain the desired compounds.
  • prodrugs can be converted to prodrugs to optimize absorption and bioavailability.
  • Formation of a prodrug include, but is not limited to, reaction of a free hydroxyl group with a carboxylic acid to form an ester, reaction of a free hydroxyl group with an phosphorus oxychloride followed by hydrolysis to form a phosphate, or reaction of a free hydroxyl group with an amino acid to form an amino acid ester, the process of which has been described previously by Chandran in WO 2005/046575 .
  • the compounds of present invention may be prepared by techniques described in Vogel's Textbook of Practical Organic Chemistry, A.I. Vogel, A.R. Tatchell, B.S. Furnis, A.J. Hannaford, P.W.G. Smith, (Prentice Hall) 5th Edition (1996 ), March's Advanced Organic Chemistry: Reactions, Mechanisms, and Structure, Michael B. Smith, Jerry March, (Wiley-Interscience) 5th Edition (2007 ), and references therein, which are incorporated by reference herein. However, these may not be the only means by which to synthesize or obtain the desired compounds.
  • substituents and moieties e.g. the moieties of J, Ra and Rb
  • substituents and moieties are intended to obey the standard rules of chemical valency.
  • a structure provided herein requires a particular substituent or moiety to be divalent, (e.g. a moiety in a linear chain of moieties)
  • definitions of that substituent or moiety are divalent in order to obey the standard rules of chemical valency.
  • a compound comprises a nonproteinaceous polymer.
  • the nonproteinaceous polymer may be is a hydrophilic synthetic polymer, i.e., a polymer not otherwise found in nature.
  • hydrophilic polyvinyl polymers fall within the scope of this invention, e.g. polyvinylalcohol and polyvinylpyrrolidone.
  • polyalkylene ethers such as polyethylene glycol, polypropylene glycol, polyoxyethylene esters or methoxy polyethylene glycol
  • polyoxyalkylenes such as polyoxyethylene, polyoxypropylene, and block copolymers of polyoxyethylene and polyoxypropylene (Pluronics); polymethacrylates; carbomers; branched or unbranched polysaccharides which comprise the saccharide monomers D-mannose, D- and L-galactose, fucose, fructose, D-xylose, L-arabinose, D-glucuronic acid, sialic acid, D-galacturontc acid, D-mannuronic acid (e.g.
  • polymannuronic acid or alginic acid
  • D-glucosamine D-galactosamine
  • D-glucose and neuraminic acid including homopolysaccharides and heteropolysaccharides such as lactose, amylopectin, starch, hydroxyethyl starch, amylose, dextran sulfate, dextran, dextrins, glycogen, or the polysaccharide subunit of acid mucopolysaccharides, e.g. hyaluronic acid; polymers of sugar alcohols such as polysorbitol and polymannitol; and heparin or heparon.
  • Salts of the compounds disclosed herein are within the scope of the invention.
  • a “salt” is salt of the instant compounds which has been modified by making acid or base salts of the compounds.
  • Fc domain generally refers to a monomer or dimer complex, comprising the C-terminal polypeptide sequences of an immunoglobulin heavy chain.
  • the Fc domain may comprise native or variant Fc sequences.
  • the human IgG heavy chain Fc domain is usually defined to stretch from an amino acid residue in the hinge region to the carboxyl terminus of the Fc sequence.
  • the Fc sequence of an immunoglobulin generally comprises two constant regions, a CH2 region and a CH3 region, and optionally comprises a CH4 region.
  • a human Fc domain may be obtained from any suitable immunoglobulin, such as the IgG1, IgG2, IgG3, or IgG4 subtypes, IgA, IgE, IgD or IgM.
  • Suitable Fc domains are prepared by recombinant DNA expression of pre-Fc chimeric polypeptides comprising 1) a signal peptide, obtained from a secreted or transmembrane protein, that is cleaved in front of a mature polypeptide having an N-terminal cysteine residue, contiguous with 2) an Fc domain polypeptide having an N-terminal cysteine residue.
  • Suitable examples of signal peptides are sonic hedgehog (SHH) (GenBank Acc. No. NM000193), IFNalpha-2 (IFN) (GenBank Acc. No. NP000596), and cholesterol ester transferase (CETP) (GenBank Accession No. NM000078).
  • SHH sonic hedgehog
  • IFN IFNalpha-2
  • CETP cholesterol ester transferase
  • Other suitable examples include Indian hedgehog (Genbank Acc. No. NM002181), desert hedgehog (Genbank Acc. No. NM021044), IFNalpha-1 (Genbank Acc. No. NP076918), IFNalpha-4 (Genbank Acc. No. NM021068), IFNalpha-5 (Genbank Acc. No. NM002169), IFNalpha-6 (Genbank Acc. No.
  • IFNalpha-7 (Genbank Acc. No. NM021057)
  • IFNalpha-8 (Genbank Acc. No. NM002170)
  • IFNalpha-10 (Genbank Acc. No. NM002171)
  • IFNalpha-13 (Genbank Acc. No. NM006900)
  • IFNalpha-14 (Genbank Acc. No. NM002172)
  • IFNalpha-16 (Genbank Acc. No. NM002173), IFNalpha-17 (Genbank Acc. No. NM021268) and IFNalpha-21 (Genbank Acc. No. NM002175).
  • Fc domains and their pre-Fc chimeric polypeptides are shown in SEQ ID NO: 1 through SEQ ID NO: 96.
  • the Fc domains are obtained by expressing the pre-Fc chimeric polypeptides in cells under conditions leading to their secretion and cleavage of the signal peptide.
  • the pre-Fc polypeptides may be expressed in either prokaryotic or eukaryotic host cells.
  • mammalian host cells are transfected with expression vectors encoding the pre-Fc polypeptides.
  • Human IgG1 Fc domains having the N-terminal sequence CDKTHTCPPCPAPE, CPPCPAPE, and CPAPE are shown in SEQ ID NO: 1, SEQ ID NO: 9, and SEQ ID NO: 17, respectively, and the DNA sequences encoding them are shown in SEQ ID NO: 2, SEQ ID NO: 10, and SEQ ID NO: 18, respectively.
  • the IgG1 domain of SEQ ID NO: 1 is obtained by expressing the pre-Fc chimeric polypeptides shown in SEQ ID NO: 3 (SHH signal peptide), SEQ ID NO: 5 (IFN signal peptide), and SEQ ID NO: 7 (CETP signal peptide), using the DNA sequences shown in SEQ ID NO: 4, SEQ ID NO: 6, and SEQ ID NO: 8, respectively.
  • the IgG1 domain of SEQ ID NO: 9 is obtained by expressing the pre-Fc chimeric polypeptides shown in SEQ ID NO: 11 (SHH signal peptide), SEQ ID NO: 13 (IFN signal peptide), and SEQ ID NO: 15 (CETP signal peptide), using the DNA sequences shown in SEQ ID NO: 12, SEQ ID NO: 14, and SEQ ID NO: 16, respectively.
  • the IgG1 domain of SEQ ID NO: 17 is obtained by expressing the pre-Fc chimeric polypeptides shown in SEQ ID NO: 19 (SHH signal peptide), SEQ ID NO: 21 (IFN signal peptide), and SEQ ID NO: 23 (CETP signal peptide), using the DNA sequences shown in SEQ ID NO: 20, SEQ ID NO: 22, and SEQ ID NO: 24, respectively.
  • Human IgG2 Fc domains having the N-terminal sequence CCVECPPCPAPE, CVECPPCPAPE, CPPCPAPE, and CPAPE are shown in SEQ ID NO: 25, SEQ ID NO: 33, SEQ ID NO: 41, and SEQ ID NO: 49, respectively, and the DNA sequences encoding them are shown in SEQ ID NO: 26, SEQ ID NO: 34, SEQ ID NO: 42, and SEQ ID NO: 50, respectively.
  • the IgG2 domain of SEQ ID NO: 25 is obtained by expressing the pre-Fc chimeric polypeptides shown in SEQ ID NO: 27 (SHH signal peptide), SEQ ID NO: 29 (IFN signal peptide), and SEQ ID NO: 31 (CETP signal peptide), using the DNA sequences shown in SEQ ID NO: 28, SEQ ID NO: 30, and SEQ ID NO: 32, respectively.
  • the IgG2 domain of SEQ ID NO: 33 is obtained by expressing the pre-Fc chimeric polypeptides shown in SEQ ID NO: 35 (SHH signal peptide), SEQ ID NO: 37 (IFN signal peptide), and SEQ ID NO: 39 (CETP signal peptide) using the DNA sequences shown in SEQ ID NO: 36, SEQ ID NO: 38, and SEQ ID NO: 40, respectively.
  • the IgG2 domain of SEQ ID NO: 41 is obtained from the pre-Fc chimeric polypeptides shown in SEQ ID NO: 43 (SHH signal peptide), SEQ ID NO: 45 (IFN signal peptide), and SEQ ID NO: 47 (CETP signal peptide), using the DNA sequences shown in SEQ ID NO: 44, SEQ ID NO: 46, and SEQ ID NO: 48, respectively.
  • the IgG2 domain of SEQ ID NO: 49 is obtained from the pre-Fc chimeric polypeptides shown in SEQ ID NO: 51 (SHH signal peptide), SEQ ID NO: 53 (IFN signal peptide), and SEQ ID NO: 55 (CETP signal peptide), using the DNA sequences shown in SEQ ID NO: 52, SEQ ID NO: 54, and SEQ ID NO: 56, respectively.
  • Human IgG3 Fc domains having the N-terminal sequence (CPRCPEPKSDTPPP) 3 -CPRCPAPE, CPRCPAPE, and CPAPE are shown in SEQ ID NO: 57, SEQ ID NO: 65, and SEQ ID NO: 73, respectively, and the DNA sequences encoding them are shown in SEQ ID NO: 58, SEQ ID NO: 66, SEQ ID NO: 42, and SEQ ID NO: 74, respectively.
  • the IgG3 domain of SEQ ID NO: 57 is obtained by expressing the pre-Fc chimeric polypeptides shown in SEQ ID NO: 59 (SHH signal peptide), SEQ ID NO: 61 (IFN signal peptide), and SEQ ID NO: 63 (CETP signal peptide), using the DNA sequences shown in SEQ ID NO: 60, SEQ ID NO: 62, and SEQ ID NO: 64, respectively.
  • the IgG3 domain of SEQ ID NO: 65 is obtained by expressing the pre-Fc chimeric polypeptides shown in SEQ ID NO: 67 (SHH signal peptide), SEQ ID NO: 69 (IFN signal peptide), and SEQ ID NO: 71 (CETP signal peptide), using the DNA sequences shown in SEQ ID NO: 68, SEQ ID NO: 70, and SEQ ID NO: 72, respectively.
  • the IgG3 domain of SEQ ID NO: 73 is obtained by expressing the pre-Fc chimeric polypeptides shown in SEQ ID NO: 75 (SHH signal peptide), SEQ ID NO: 77 (IFN signal peptide), and SEQ ID NO: 79 (CETP signal peptide), using the DNA sequences shown in SEQ ID NO: 76, SEQ ID NO: 78, and SEQ ID NO: 80, respectively.
  • the sequences of human IgG4 Fc domains having the N-terminal sequence CPSCPAPE and CPAPE are shown in SEQ ID NO: 81 and SEQ ID NO: 89, respectively, and the DNA sequences encoding them are shown in SEQ ID NO: 82 and SEQ ID NO: 90, respectively.
  • the IgG4 domain of SEQ ID NO: 81 is obtained by expressing the pre-Fc chimeric polypeptides shown in SEQ ID NO: 83 (SHH signal peptide), SEQ ID NO: 85 (IFN signal peptide), and SEQ ID NO: 87 (CETP signal peptide), using the DNA sequences shown in SEQ ID NO: 84, SEQ ID NO: 86, and SEQ ID NO: 88, respectively.
  • the IgG4 domain of SEQ ID NO: 89 is obtained by expressing the pre-Fc chimeric polypeptides shown in SEQ ID NO: 91 (SHH signal peptide), SEQ ID NO: 93 (IFN signal peptide), and SEQ ID NO: 95 (CETP signal peptide), using the DNA sequences shown in SEQ ID NO: 92, SEQ ID NO: 94, and SEQ ID NO: 96, respectively.
  • Suitable antibody variants having at their heavy chain N-terminus a cysteine residue are prepared by recombinant DNA expression of pre-heavy chain chimeric polypeptides comprising 1) a signal peptide, obtained from a secreted or transmembrane protein, that is cleaved in front of a mature polypeptide having an N-terminal cysteine residue, contiguous with 2) a antibody heavy chain polypeptide having an N-terminal cysteine residue.
  • Suitable antibody variants having at their light chain N-terminus a cysteine residue are prepared by recombinant DNA expression of pre-light chain chimeric polypeptides comprising 1) a signal peptide, obtained from a secreted or transmembrane protein, that is cleaved in front of a mature polypeptide having an N-terminal cysteine residue, contiguous with 2) a antibody light chain polypeptide having an N-terminal cysteine residue.
  • Trastuzumab heavy and light chains are obtained by expressing the pre-heavy and pre-light chimeric polypeptides in cells under conditions leading to their secretion and cleavage of the signal peptide.
  • the pre-heavy chain and pre-light chain polypeptides may be expressed in either prokaryotic or eukaryotic host cells.
  • mammalian host cells are transfected with expression vectors encoding the pre-heavy chain and pre-light chain polypeptides.
  • Protein sequences added to the N-terminus of the aforementioned antibody heavy chain, pre-heavy chain, light chain, and pre-light chain variants are illustrated herein for the recombinant antibody trastuzumab, but are generally applicable to any recombinant antibody.
  • DNA sequences encoding trastuzumab and its variants may be constructed and expressed in mammalian cells by cotransfecting DNA vectors for its heavy and light chains, and variants derived thereof, as described in U.S. Patent No. 5,821,337 ("Immunoglobulin Variants") which is hereby incorporated by reference.
  • the amino acid sequence of the wild-type trastuzumab light and heavy chains are shown in SEQ ID NO: 128 and SEQ ID NO: 129, respectively.
  • trastuzumab light chains with N-terminal cysteine residues and their pre-Fc chimeric polypeptides are shown in SEQ ID NO: 130 through SEQ ID NO: 165.
  • Suitable examples of trastuzumab heavy chains with N-terminal cysteine residues and their pre-Fc chimeric polypeptides are shown in SEQ ID NO: 166 through SEQ ID NO: 201.
  • Trastuzumab light chains having the N-terminal sequence C, CP, CPP, CPR, CPS, CDKT, CDKTHT, CVE, and CDTPPP are shown in SEQ ID NO: 130, SEQ ID NO: 134, SEQ ID NO: 138, SEQ ID NO: 142, SEQ ID NO: 146, SEQ ID NO: 150, SEQ ID NO: 154, SEQ ID NO: 158, and SEQ ID NO: 162, respectively.
  • the light chain of SEQ ID NO: 130 is obtained by expressing the pre- light chimeric polypeptides shown in SEQ ID NO: 131 (SHH signal peptide), SEQ ID NO: 132 (IFN signal peptide), and SEQ ID NO: 133 (CETP signal peptide).
  • the light chain of SEQ ID NO: 134 is obtained by expressing the pre- light chain chimeric polypeptides shown in SEQ ID NO: 135 (SHH signal peptide), SEQ ID NO: 136 (IFN signal peptide), and SEQ ID NO: 137 (CETP signal peptide).
  • the light chain of SEQ ID NO: 138 is obtained by expressing the pre- light chimeric polypeptides shown in SEQ ID NO: 139 (SHH signal peptide), SEQ ID NO: 140 (IFN signal peptide), and SEQ ID NO: 141 (CETP signal peptide).
  • the light chain of SEQ ID NO: 142 is obtained by expressing the pre- light chimeric polypeptides shown in SEQ ID NO: 143 (SHH signal peptide), SEQ ID NO: 144 (IFN signal peptide), and SEQ ID NO: 145 (CETP signal peptide).
  • the light chain of SEQ ID NO: 146 is obtained by expressing the pre-heay light chimeric polypeptides shown in SEQ ID NO: 147 (SHH signal peptide), SEQ ID NO: 148 (IFN signal peptide), and SEQ ID NO: 149 (CETP signal peptide).
  • the light chain of SEQ ID NO: 150 is obtained by expressing the pre- light chimeric polypeptides shown in SEQ ID NO: 151 (SHH signal peptide), SEQ ID NO: 152 (IFN signal peptide), and SEQ ID NO: 153 (CETP signal peptide).
  • the light chain of SEQ ID NO: 154 is obtained by expressing the pre- light chimeric polypeptides shown in SEQ ID NO: 155 (SHH signal peptide), SEQ ID NO: 156 (IFN signal peptide), and SEQ ID NO: 157 (CETP signal peptide).
  • the light chain of SEQ ID NO: 158 is obtained by expressing the pre- light chimeric polypeptides shown in SEQ ID NO: 159 (SHH signal peptide), SEQ ID NO: 160 (IFN signal peptide), and SEQ ID NO: 161 (CETP signal peptide).
  • the light chain of SEQ ID NO: 162 is obtained by expressing the pre- light chimeric polypeptides shown in SEQ ID NO: 163 (SHH signal peptide), SEQ ID NO: 164 (IFN signal peptide), and SEQ ID NO: 165 (CETP signal peptide).
  • Trastuzumab heavy chains having the N-terminal sequence C, CP, CPP, CPR, CPS, CDKT, CDKTHT, CVE, and CDTPPP are shown in SEQ ID NO: 166, SEQ ID NO: 170, SEQ ID NO: 174, SEQ ID NO: 178, SEQ ID NO: 182, SEQ ID NO: 186, SEQ ID NO: 190, SEQ ID NO: 194, and SEQ ID NO: 198, respectively.
  • the heavy chain of SEQ ID NO: 166 is obtained by expressing the pre-heavy chain chimeric polypeptides shown in SEQ ID NO: 167 (SHH signal peptide), SEQ ID NO: 168 (IFN signal peptide), and SEQ ID NO: 169 (CETP signal peptide).
  • the heavy chain of SEQ ID NO: 170 is obtained by expressing the pre-heavy chain chimeric polypeptides shown in SEQ ID NO: 171 (SHH signal peptide), SEQ ID NO: 172 (IFN signal peptide), and SEQ ID NO: 173 (CETP signal peptide).
  • the heavy chain of SEQ ID NO: 174 is obtained from the pre-heavy chain chimeric polypeptides shown in SEQ ID NO: 175 (SHH signal peptide), SEQ ID NO: 176 (IFN signal peptide), and SEQ ID NO: 177 (CETP signal peptide).
  • the heavy chain of SEQ ID NO: 178 is obtained from the pre-heavy chain chimeric polypeptides shown in SEQ ID NO: 179 (SHH signal peptide), SEQ ID NO: 180 (IFN signal peptide), and SEQ ID NO: 181 (CETP signal peptide).
  • the heavy chain of SEQ ID NO: 182 is obtained by expressing the pre-heavy chain chimeric polypeptides shown in SEQ ID NO: 183 (SHH signal peptide), SEQ ID NO: 184 (IFN signal peptide), and SEQ ID NO: 185 (CETP signal peptide).
  • the heavy chain of SEQ ID NO: 186 is obtained by expressing the pre-heavy chain chimeric polypeptides shown in SEQ ID NO: 187 (SHH signal peptide), SEQ ID NO: 188 (IFN signal peptide), and SEQ ID NO: 189 (CETP signal peptide).
  • the heavy chain of SEQ ID NO: 190 is obtained from the pre-heavy chain chimeric polypeptides shown in SEQ ID NO: 191 (SHH signal peptide), SEQ ID NO: 192 (IFN signal peptide), and SEQ ID NO: 193 (CETP signal peptide).
  • the heavy chain of SEQ ID NO: 194 is obtained from the pre-heavy chain chimeric polypeptides shown in SEQ ID NO: 195 (SHH signal peptide), SEQ ID NO: 196 (IFN signal peptide), and SEQ ID NO: 197 (CETP signal peptide).
  • the heavy chain of SEQ ID NO: 198 is obtained from the pre-heavy chain chimeric polypeptides shown in SEQ ID NO: 199 (SHH signal peptide), SEQ ID NO: 200 (IFN signal peptide), and SEQ ID NO: 201 (CETP signal peptide).
  • Suitable host cells include 293 human embryonic cells (ATCC CRL-1573) and CHO-K1 hamster ovary cells (ATCC CCL-61) obtained from the American Type Culture Collection (Rockville, Md.). Cells are grown at 37°C. in an atmosphere of air, 95%; carbon dioxide, 5%. 293 cells are maintained in Minimal essential medium (Eagle) with 2 mM L-glutamine and Earle's BSS adjusted to contain 1.5 g/L sodium bicarbonate, 0.1 mM non-essential amino acids, and 1.0 mM sodium pyruvate, 90%; fetal bovine serum, 10%.
  • Minimal essential medium Eagle
  • 2 mM L-glutamine and Earle's BSS adjusted to contain 1.5 g/L sodium bicarbonate, 0.1 mM non-essential amino acids, and 1.0 mM sodium pyruvate, 90%; fetal bovine serum, 10%.
  • CHO-K1 cells are maintained in Ham's F12K medium with 2 mM L-glutamine adjusted to contain 1.5 g/L sodium bicarbonate, 90%; fetal bovine serum, 10%.
  • Other suitable host cells include CV1 monkey kidney cells (ATCC CCL-70), COS-7 monkey kidney cells (ATCC CRL-1651), VERO-76 monkey kidney cells (ATCC CRL-1587), HELA human cervical cells (ATCC CCL-2), W138 human lung cells (ATCC CCL-75), MDCK canine kidney cells (ATCC CCL-34), BRL3A rat liver cells (ATCC CRL-1442), BHK hamster kidney cells (ATCC CCL-10), MMT060562 mouse mammary cells (ATCC CCL-51), and human CD8.sup.+ T lymphocytes (described in U.S. Ser. No. 08/258,152 incorporated herein in its entirety by reference).
  • Plasmid pSA contains the following DNA sequence elements: 1) pBluescriptIIKS(+) (nucleotides 912-2941/1-619, GenBank Accession No. X52327), 2) a human cytomegalovirus promoter, enhancer, and first exon splice donor (nucleotides 63-912, GenBank Accession No. K03104), 3) a human alpha1-globin second exon splice acceptor (nucleotides 6808-6919, GenBank Accession No.
  • SV40 T antigen polyadenylation site (nucleotides 2770-2533, Reddy et al. (1978) Science 200, 494-502 ), and 5) an SV40 origin of replication (nucleotides 5725-5578, Reddy et al., ibid).
  • suitable expression vectors include plasmids pSVeCD4DHFR and pRKCD4 ( U.S. Patent No. 5,336,603 ), plasmid pIK.1.1 ( U.S. Patent No. 5,359,046 ), plasmid pVL-2 ( U.S. Patent No. 5,838,464 ), plasmid pRT43.2F3 (described in U.S. Ser. No. 08/258,152 incorporated herein in its entirety by reference).
  • Suitable expression vectors for human IgG pre-Fc polypeptides may be constructed by the ligation of a HindIII-PspOM1 vector fragment prepared from SEQ ID NO: 98, with a HindIII-EagI insert fragment prepared from SEQ ID NOS: 4, 6, 8, 12, 14, 16, 20, 22, 24, 28, 30, 32, 36, 38, 40, 44, 46, 48, 52, 54, 56, 60, 62, 64, 68, 70, 72, 76, 78, 80, 84, 86, 88, 92, 94, and 96.
  • Suitable selectable markers include the Tn5 transposon neomycin phosphotransferase (NEO) gene ( Southern and Berg (1982) J. Mol. Appl. Gen. 1, 327-341 ), and the dihydrofolate reductase (DHFR) cDNA ( Lucas et al. (1996) Nucl. Acids Res. 24, 1774-1779 ).
  • Tn5 transposon neomycin phosphotransferase (NEO) gene Southern and Berg (1982) J. Mol. Appl. Gen. 1, 327-341
  • DHFR dihydrofolate reductase
  • One example of a suitable expression vector that incorporates a NEO gene is plasmid pSA-NEO, which is constructed by ligating a first DNA fragment, prepared by digesting SEQ ID NO: 99 with EcoRI and BglII, with a second DNA fragment, prepared by digesting SEQ ID NO:98 with EcoRI and BglII.
  • SEQ ID NO:99 incorporates a NEO gene (nucleotides 1551 to 2345, Genbank Accession No. U00004) preceded by a sequence for translational initiation ( Kozak (1991) J. Biol. Chem, 266, 19867-19870 ).
  • a suitable expression vector that incorporates a NEO gene and a DHFR cDNA is plasmid pSVe-NEO-DHFR, which is constructed by ligating a first DNA fragment, prepared by digesting SEQ ID NO:99 with EcoRI and BglII, with a second DNA fragment, prepared by digesting pSVeCD4DHFR with EcoRI and BglII.
  • Plasmid pSVe-NEO-DHFR uses SV40 early promoter/enhancers to drive expression of the NEO gene and the DHFR cDNA.
  • Other suitable selectable markers include the XPGT gene ( Mulligan and Berg (1980) Science 209, 1422-1427 ) and the hygromycin resistance gene ( Sugden et al. (1985) Mol. Cell. Biol. 5, 410-413 ).
  • cells are transfected by the calcium phosphate method of Graham et al. (1977) J. Gen. Virol. 36, 59-74 .
  • a DNA mixture (10 ug) is dissolved in 0.5 ml of 1 mM Tris-HCl, 0.1 mM EDTA, and 227 mM CaCl 2 .
  • the DNA mixture contains (in a ratio of 10:1:1) the expression vector DNA, the selectable marker DNA, and a DNA encoding the VA RNA gene ( Thimmappaya et al. (1982) Cell 31, 543-551 ).
  • cells are transiently transfected by the dextran sulfate method of Somparyrac et al. (1981) Proc. Nat. Acad. Sci. 12, 7575-7579 .
  • Cells are grown to maximal density in spinner flasks, concentrated by centrifugation, and washed with PBS.
  • the DNA-dextran precipitate is incubated on the cell pellet. After 4 hours at 37°C, the DEAE-dextran is aspirated and 20% glycerol in PBS is added for 1.5 minutes.
  • the cells are then washed with serum-free medium, reintroduced into spinner flasks containing fresh culture medium with 5 micrograms/ml bovine insulin and 0.1 micrograms/ml bovine transferring, and incubated for 4 days.
  • the conditioned media is centrifuged and filtered to remove the host cells and debris.
  • the sample contained the Fc domain is then concentrated and purified by any selected method, such as dialysis and/or column chromatography (see below).
  • the culture medium is removed 24 to 96 hours after transfection, concentrated, and analyzed by SDS-polyacrylamide gel electrophoresis (SDS-PAGE) in the presence or absence of a reducing agent such as dithiothreitol.
  • plasmids are transfected into human 293 cells ( Graham et al., J. Gen. Virol. 36:59 74 (1977 )), using a high efficiency procedure ( Gorman et al., DNA Prot. Eng. Tech. 2:3 10 (1990 )). Media is changed to serum-free and harvested daily for up to five days.
  • plasmids are transfected into human 293 cells ( Graham et al., J. Gen. Virol. 36:59 74 (1977 )), using a high efficiency procedure ( Gorman et al., DNA Prot. Eng. Tech. 2:3 10 (1990 )). Media is changed to serum-free and harvested daily for up to five days.
  • the Fc domains are purified from the cell culture supernatant using HiTrap Protein A HP (Pharmacia).
  • HiTrap Protein A HP Puracia
  • the eluted Fc domains are buffer-exchanged into PBS using a Centricon-30 (Amicon), concentrated to 0.5 ml, sterile filtered using a Millex-GV (Millipore) at 4°C.
  • stretches of consecutive amino acids as referred to herein include, but are not limited to, consecutive amino acids including binding domains such as secreted or transmembrane proteins, intracellular binding domains and antibodies (whole or portions thereof) and modififed versions thereof.
  • binding domains such as secreted or transmembrane proteins, intracellular binding domains and antibodies (whole or portions thereof) and modififed versions thereof.
  • antibody is used in the broadest sense and specifically covers monoclonal antibodies (including full length monoclonal antibodies), polyclonal antibodies, multispecific antibodies (e.g., bispecific antibodies), monovalent antibodies, multivalent antibodies, and antibody fragments so long as they exhibit the desired biological activity (e.g., Fab and/or single-armed antibodies).
  • the "class" of an antibody refers to the type of constant domain or constant region possessed by its heavy chain.
  • the heavy chain constant domains that correspond to the different classes of immunoglobulins are called ⁇ , ⁇ , ⁇ , ⁇ , and ⁇ , respectively.
  • antibody fragment refers to a molecule other than an intact antibody that comprises a portion of an intact antibody that binds the antigen to which the intact antibody binds.
  • antibody fragments include but are not limited to Fv, Fab, Fab', Fab'-SH, F(ab') 2 ; diabodies; linear antibodies; single-chain antibody molecules (e.g., scFv); and multispecific antibodies formed from antibody fragments.
  • full length antibody “intact antibody,” and “whole antibody” are used herein interchangeably to refer to an antibody having a structure substantially similar to a native antibody structure or having heavy chains that contain an Fc region as defined herein.
  • a “blocking" antibody or an “antagonist” antibody is one which significantly inhibits (either partially or completely) a biological activity of the antigen it binds.
  • an "antibody that binds to the same epitope” as a reference antibody refers to an antibody that blocks binding of the reference antibody to its antigen in a competition assay by 50% or more, and conversely, the reference antibody blocks binding of the antibody to its antigen in a competition assay by 50% or more.
  • An exemplary competition assay is provided herein.
  • variable region refers to the domain of an antibody heavy or light chain that is involved in binding the antibody to antigen.
  • the variable domains of the heavy chain and light chain (VH and VL, respectively) of a native antibody generally have similar structures, with each domain comprising four conserved framework regions (FRs) and three hypervariable regions (HVRs).
  • FRs conserved framework regions
  • HVRs hypervariable regions
  • antibodies that bind a particular antigen may be isolated using a VH or VL domain from an antibody that binds the antigen to screen a library of complementary VL or VH domains, respectively. See, e.g., Portolano et al., J. Immunol. 150:880-887 (1993 ); Clarkson et al., Nature 352:624-628 (1991 ).
  • hypervariable region refers to each of the regions of an antibody variable domain which are hypervariable in sequence and/or form structurally defined loops ("hypervariable loops").
  • native four-chain antibodies comprise six HVRs; three in the VH (HI, H2, H3), and three in the VL (L1, L2, L3).
  • HVRs generally comprise amino acid residues from the hypervariable loops and/or from the "complementarity determining regions" (CDRs), the latter being of highest sequence variability and/or involved in antigen recognition.
  • CDRs complementarity determining regions
  • Exemplary hypervariable loops occur at amino acid residues 26-32 (L1), 50-52 (L2), 91-96 (L3), 26-32 (HI), 53-55 (H2), and 96-101 (H3).
  • Exemplary CDRs CDR-L1, CDR-L2, CDR-L3, CDR-H1, CDR-H2, and CDR-H3 occur at amino acid residues 24-34 of L1, 50-56 of L2, 89-97 of L3, 31-35B of H1, 50-65 of H2, and 95-102 of H3.
  • CDRs generally comprise the amino acid residues that form the hypervariable loops.
  • CDRs also comprise "specificity determining residues,” or "SDRs,” which are residues that contact antigen. SDRs are contained within regions of the CDRs called abbreviated-CDRs, or a-CDRs.
  • Exemplary a-CDRs (a-CDR-Ll, a-CDR-L2, a-CDR-L3, a-CDR-H1, a-CDR-H2, and a-CDR-H3) occur at amino acid residues 31-34 of L1, 50-55 of L2, 89-96 of L3, 31-35B of H1, 50-58 of H2, and 95-102 of H3.
  • HVR residues and other residues in the variable domain are numbered herein according to Kabat et al., supra.
  • FR Framework or "FR” refers to variable domain residues other than hypervariable region (HVR) residues.
  • the FR of a variable domain generally consists of four FR domains: FR1, FR2, FR3, and FR4. Accordingly, the HVR and FR sequences generally appear in the following sequence in VH (or VL): FR1-H1(L1)-FR2-H2(L2)-FR3-H3(L3)-FR4.
  • N-terminally truncated heavy chain refers to a polypeptide comprising parts but not all of a full length immunoglobulin heavy chain, wherein the missing parts are those normally located on the N terminal region of the heavy chain. Missing parts may include, but are not limited to, the variable domain, CH1, and part or all of a hinge sequence. Generally, if the wild type hinge sequence is not present, the remaining constant domain(s) in the N-terminally truncated heavy chain would comprise a component that is capable of linkage to another Fc sequence (i.e., the "first" Fc polypeptide as described herein). For example, said component can be a modified residue or an added cysteine residue capable of forming a disulfide linkage.
  • Fc receptor or “FcR” describes a receptor that binds to the Fc region of an antibody.
  • an FcR is a native human FcR.
  • an FcR is one which binds an IgG antibody (a gamma receptor) and includes receptors of the Fc ⁇ RI, Fc ⁇ RII, and Fc ⁇ RIII subclasses, including allelic variants and alternatively spliced forms of those receptors.
  • Fc ⁇ RII receptors include Fc ⁇ RIIA (an "activating receptor") and Fc ⁇ RIIB (an “inhibiting receptor”), which have similar amino acid sequences that differ primarily in the cytoplasmic domains thereof.
  • Activating receptor Fc ⁇ RIIA contains an immunoreceptor tyrosine-based activation motif (ITAM) in its cytoplasmic domain
  • Inhibiting receptor Fc ⁇ RIIB contains an immunoreceptor tyrosine-based inhibition motif (ITIM) in its cytoplasmic domain.
  • ITAM immunoreceptor tyrosine-based activation motif
  • ITIM immunoreceptor tyrosine-based inhibition motif
  • Fc receptor or “FcR” also includes the neonatal receptor, FcRn, which is responsible for the transfer of maternal IgGs to the fetus ( Guyer et al., J. Immunol. 117:587 (1976 ) and Kim et al., J. Immunol. 24:249 (1994 )) and regulation of homeostasis of immunoglobulins. Methods of measuring binding to FcRn are known (see, e.g., Ghetie and Ward., Immunol. Today 18(12):592-598 (1997 ); Ghetie et al., Nature Biotechnology, 15(7):637-640 (1997 ); Hinton et al., J. Biol. Chem. 279(8):6213-6216 (2004 ); WO 2004/92219 (Hinton et al. ).
  • Binding to human FcRn in vivo and serum half life of human FcRn high affinity binding polypeptides can be assayed, e.g., in transgenic mice or transfected human cell lines expressing human FcRn, or in primates to which the polypeptides with a variant Fc region are administered.
  • WO 2000/42072 (Presta ) describes antibody variants with improved or diminished binding to FcRs. See also, e.g., Shields et al. J. Biol. Chem. 9(2):6591-6604 (2001 ).
  • the "hinge region,” “hinge sequence”, and variations thereof, as used herein, includes the meaning known in the art, which is illustrated in, for example, Janeway et al., Immuno Biology: the immune system in health and disease, (Elsevier Science Ltd., NY) (4th ed., 1999 ); Bloom et al., Protein Science (1997), 6:407-415 ; Humphreys et al., J. Immunol. Methods (1997), 209:193-202 .
  • multivalent antibody is used throughout this specification to denote an antibody comprising three or more antigen binding sites.
  • the multivalent antibody is preferably engineered to have the three or more antigen binding sites and is generally not a native sequence IgM or IgA antibody.
  • an “Fv” fragment is an antibody fragment which contains a complete antigen recognition and binding site.
  • This region consists of a dimer of one heavy and one light chain variable domain in tight association, which can be covalent in nature, for example in scFv. It is in this configuration that the three HVRs of each variable domain interact to define an antigen binding site on the surface of the VH-VL dimer.
  • the six HVRs or a subset thereof confer antigen binding specificity to the antibody.
  • a single variable domain or half of an Fv comprising only three HVRs specific for an antigen
  • the "Fab” fragment contains a variable and constant domain of the light chain and a variable domain and the first constant domain (CH1) of the heavy chain.
  • F(ab') 2 antibody fragments comprise a pair of Fab fragments which are generally covalently linked near their carboxy termini by hinge cysteines between them. Other chemical couplings of antibody fragments are also known in the art.
  • antigen binding arm refers to a component part of an antibody fragment that has an ability to specifically bind a target molecule of interest.
  • the antigen binding arm is a complex of immunoglobulin polypeptide sequences, e.g., HVR and/or variable domain sequences of an immunoglobulin light and heavy chain.
  • Single-chain Fv or “scFv” antibody fragments comprise the VH and VL domains of antibody, wherein these domains are present in a single polypeptide chain.
  • the Fv polypeptide further comprises a polypeptide linker between the VH and VL domains, which enables the scFv to form the desired structure for antigen binding.
  • diabodies refers to small antibody fragments with two antigen-binding sites, which fragments comprise a heavy chain variable domain (V H ) connected to a light chain variable domain (V L ) in the same polypeptide chain (V H and V L ).
  • V H heavy chain variable domain
  • V L light chain variable domain
  • linear antibodies refers to the antibodies described in Zapata et al., Protein Eng., 8(10):1057-1062 (1995 ). Briefly, these antibodies comprise a pair of tandem Fd segments (V.sub.H-C.sub.H1-V.sub.H-C.sub.H1) which, together with complementary light chain polypeptides, form a pair of antigen binding regions. Linear antibodies can be bispecific or monospecific.
  • monoclonal antibody refers to an antibody obtained from a population of substantially homogeneous antibodies, i.e., the individual antibodies comprising the population are identical and/or bind the same epitope, except for possible variant antibodies, e.g., containing naturally occurring mutations or arising during production of a monoclonal antibody preparation, such variants generally being present in minor amounts.
  • polyclonal antibody preparations typically include different antibodies directed against different determinants (epitopes)
  • each monoclonal antibody of a monoclonal antibody preparation is directed against a single determinant on an antigen.
  • the modifier "monoclonal” indicates the character of the antibody as being obtained from a substantially homogeneous population of antibodies, and is not to be construed as requiring production of the antibody by any particular method.
  • the monoclonal antibodies to be used may be made by a variety of techniques, including but not limited to the hybridoma method, recombinant DNA methods, phage-display methods, and methods utilizing transgenic animals containing all or part of the human immunoglobulin loci, such methods and other exemplary methods for making monoclonal antibodies being described herein.
  • chimeric antibody refers to an antibody in which a portion of the heavy and/or light chain is derived from a particular source or species, while the remainder of the heavy and/or light chain is derived from a different source or species.
  • a “humanized” antibody refers to a chimeric antibody comprising amino acid residues from non-human HVRs and amino acid residues from human FRs.
  • a humanized antibody will comprise substantially all of at least one, and typically two, variable domains, in which all or substantially all of the HVRs (e.g., CDRs) correspond to those of a non-human antibody, and all or substantially all of the FRs correspond to those of a human antibody.
  • a humanized antibody optionally may comprise at least a portion of an antibody constant region derived from a human antibody.
  • a "humanized form" of an antibody, e.g., a non-human antibody refers to an antibody that has undergone humanization.
  • a "human antibody” is one which possesses an amino acid sequence which corresponds to that of an antibody produced by a human or a human cell or derived from a non-human source that utilizes human antibody repertoires or other human antibody-encoding sequences. This definition of a human antibody specifically excludes a humanized antibody comprising non-human antigen-binding residues.
  • naked antibody refers to an antibody that is not conjugated to a heterologous moiety (e.g., a cytotoxic moiety) or radiolabel.
  • the naked antibody may be present in a pharmaceutical formulation.
  • Native antibodies refer to naturally occurring immunoglobulin molecules with varying structures.
  • native IgG antibodies are heterotetrameric glycoproteins of about 150,000 Daltons, composed of two identical light chains and two identical heavy chains that are disulfide-bonded. From N- to C-terminus, each heavy chain has a variable region (VH), also called a variable heavy domain or a heavy chain variable domain, followed by three constant domains (CH1, CH2, and CH3).
  • VH variable region
  • VL variable region
  • the light chain of an antibody may be assigned to one of two types, called kappa ( ⁇ ) and lambda ( ⁇ ), based on the amino acid sequence of its constant domain.
  • Bind refers to the strength of the sum total of noncovalent interactions between a single binding site of a molecule (e.g., an antibody) and its binding partner (e.g., an antigen).
  • binding affinity refers to intrinsic binding affinity which reflects a 1:1 interaction between members of a binding pair (e.g., antibody and antigen).
  • the affinity of a molecule X for its partner Y can generally be represented by the dissociation constant (Kd). Affinity can be measured by common methods known in the art, including those described herein. Specific illustrative and exemplary embodiments for measuring binding affinity are described in the following.
  • an “affinity matured” antibody refers to an antibody with one or more alterations in one or more HVRs, compared to a parent antibody which does not possess such alterations, such alterations resulting in an improvement in the affinity of the antibody for antigen.
  • An antibody having a "biological characteristic" of a designated antibody is one which possesses one or more of the biological characteristics of that antibody which distinguish it from other antibodies that bind to the same antigen.
  • a "functional antigen binding site" of an antibody is one which is capable of binding a target antigen.
  • the antigen binding affinity of the antigen binding site is not necessarily as strong as the parent antibody from which the antigen binding site is derived, but the ability to bind antigen must be measurable using any one of a variety of methods known for evaluating antibody binding to an antigen.
  • the antigen binding affinity of each of the antigen binding sites of a multivalent antibody herein need not be quantitatively the same.
  • the number of functional antigen binding sites can be evaluated using ultracentrifugation analysis as described in Example 2 of U.S. Patent Application Publication No. 20050186208 .
  • a “species-dependent antibody” is one which has a stronger binding affinity for an antigen from a first mammalian species than it has for a homologue of that antigen from a second mammalian species.
  • the species-dependent antibody "binds specifically" to a human antigen (i.e. has a binding affinity (K.sub.d) value of no more than about 1.times.10.sup.-7 M, preferably no more than about 1. times.
  • the species-dependent antibody can be any of the various types of antibodies as defined above. In some embodiments, the species-dependent antibody is a humanized or human antibody.
  • an “isolated” antibody is one which has been separated from a component of its natural environment.
  • an antibody is purified to greater than 95% or 99% purity as determined by, for example, electrophoretic (e.g., SDS-PAGE, isoelectric focusing (IEF), capillary electrophoresis) or chromatographic (e.g., ion exchange or reverse phase HPLC).
  • electrophoretic e.g., SDS-PAGE, isoelectric focusing (IEF), capillary electrophoresis
  • chromatographic e.g., ion exchange or reverse phase HPLC
  • Extracellular proteins play important roles in, among other things, the formation, differentiation and maintenance of multicellular organisms.
  • a discussion of various intracellular proteins of interest is set forth in U.S. Patent No. 6,723,535, Ashkenazi et al., issued April 20, 2004 , hereby incorporated by reference.
  • the fate of many individual cells is typically governed by information received from other cells and/or the immediate environment. This information is often transmitted by secreted polypeptides (for instance, mitogenic factors, survival factors, cytotoxic factors, differentiation factors, neuropeptides, and hormones) which are, in turn, received and interpreted by diverse cell receptors or membrane-bound proteins.
  • secreted polypeptides for instance, mitogenic factors, survival factors, cytotoxic factors, differentiation factors, neuropeptides, and hormones
  • secreted polypeptides or signaling molecules normally pass through the cellular secretory pathway to reach their site of action in the extracellular environment.
  • Secreted proteins have various industrial applications, including as pharmaceuticals, diagnostics, biosensors and bioreactors.
  • Most protein drugs available at present, such as thrombolytic agents, interferons, interleukins, erythropoietins, colony stimulating factors, and various other cytokines, are secretory proteins.
  • Their receptors, which are membrane proteins, also have potential as therapeutic or diagnostic agents.
  • Efforts are being undertaken by both industry and proficient to identify new, native secreted proteins. Many efforts are focused on the screening of mammalian recombinant DNA libraries to identify the coding sequences for novel secreted proteins. Examples of screening methods and techniques are described in the literature (see, for example, Klein et al., Proc. Natl. Acad. Sci. 93:7108-7113 (1996 ); U.S. Patent No. 5,536,637 )).
  • Membrane-bound proteins and receptors can play important roles in, among other things, the formation, differentiation and maintenance of multicellular organisms.
  • membrane-bound proteins and cell receptors include, but are not limited to, cytokine receptors, receptor kinases, receptor phosphatases, receptors involved in cell-cell interactions, and cellular adhesin molecules like selectins and integrins. For instance, transduction of signals that regulate cell growth and differentiation is regulated in part by phosphorylation of various cellular proteins. Protein tyrosine kinases, enzymes that catalyze that process, can also act as growth factor receptors. Examples include fibroblast growth factor receptor and nerve growth factor receptor.
  • Membrane-bound proteins and receptor molecules have various industrial applications, including as pharmaceutical and diagnostic agents.
  • Receptor immunoadhesins for instance, can be employed as therapeutic agents to block receptor-ligand interactions.
  • the membrane-bound proteins can also be employed for screening of potential peptide or small molecule inhibitors of the relevant receptor/ligand interaction.
  • inteins are the protein equivalent of the self-splicing RNA introns (see Perler et al., Nucleic Acids Res. 22:1125-1127 (1994 )), which catalyze their own excision from a precursor protein with the concomitant fusion of the flanking protein sequences, known as exteins (reviewed in Perler et al., Curr. Opin. Chem. Biol. 1:292-299 (1997 ); Perler, F. B. Cell 92(1):1-4 (1998 ); Xu et al., EMBO J. 15(19):5146-5153 (1996 )).
  • the bacterially expressed protein with the C-terminal thioester is then fused to a chemically-synthesized peptide with an N-terminal cysteine using the chemistry described for "native chemical ligation" ( Evans et al., Protein Sci. 7:2256-2264 (1998 ); Muir et al., Proc. Natl. Acad. Sci. USA 95:6705-6710 (1998 )).
  • IPL intein-mediated protein ligation
  • IPL technology was significantly expanded when an expressed protein with a predetermined N-terminus, such as cysteine, was generated, as described for example in U.S. Patent No. 6,849,428 .
  • This allows the fusion of one or more expressed proteins from a host cell, such as bacterial, yeast or mammalian cells.
  • a host cell such as bacterial, yeast or mammalian cells.
  • the intein a modified RIR1 Methanobacterium thermoautotrophicum is that cleaves at either the C-terminus or N-terminus is used which allows for the release of a bacterially expressed protein during a one-column purification, thus eliminating the need proteases entirely.
  • the subunits of the compounds of the invention are obtained by transfecting suitable cells, capable of expressing and secreting mature chimeric polypeptides, wherein such polypeptides comprise, for example, an adhesin domain contiguous with an isolatable c-terminal intein domain (see U.S. Patent No. 6,849,428, Evans et al., issued February 1, 2005 , hereby incorporated by reference).
  • the cells such as mammalian cells or bacterial cells, are transfected using known recombinant DNA techniques.
  • the secreted chimeric polypeptide can then be isolated, e.g.
  • a thioester intermediate is generated that permits the facile addition of cysteine, selenocysteine, homocysteine, or homoselenocysteine, or a derivative of cysteine, selenocysteine, homocysteine, homoselenocysteine, to the C-terminus by native chemical ligation.
  • kits comprising the compounds disclosed herein and the pharmaceutical compositions comprising these compounds.
  • a kit may include, in addition to the compound or pharmaceutical composition, diagnostic or therapeutic agents.
  • a kit may also include instructions for use in a diagnostic or therapeutic method.
  • the kit includes the compound or a pharmaceutical composition thereof and a diagnostic agent.
  • the kit includes the antibody or a pharmaceutical composition thereof and one or more therapeutic agents, such as an additional antineoplastic agent, anti-tumor agent or chemotherapeutic agent.
  • amino acid sequence or portions thereof, may be produced by direct peptide synthesis using solid-phase techniques (see, e.g., Stewart et al., Solid-Phase Peptide Synthesis, W.H. Freeman Co., San Francisco, Calif. (1969 ); Merrifield, J. Am. Chem. Soc., 85:2149-2154 (1963 )). In vitro protein synthesis may be performed using manual techniques or by automation.
  • Automated synthesis may be accomplished, for instance, using an Applied Biosystems Peptide Synthesizer (Foster City, Calif.) using manufacturer's instructions.
  • Various portions of the stretches of consecutive amino acids or polypeptides of interest may be chemically synthesized separately and combined using chemical or enzymatic methods to produce the full-length stretches of consecutive amino acids or polypeptides of interest.
  • Host cells are transfected or transformed with expression or cloning vectors described herein for production and cultured in conventional nutrient media modified as appropriate for inducing promoters, selecting transformants, or amplifying the genes encoding the desired sequences.
  • the culture conditions such as media, temperature, pH and the like, can be selected by the skilled artisan without undue experimentation. In general, principles, protocols, and practical techniques for maximizing the productivity of cell cultures can be found in Mammalian Cell Biotechnology: a Practical Approach, M. Butler, ed. (IRL Press, 1991 ) and Sambrook et al., supra.
  • Methods of eukaryotic cell transfection and prokaryotic cell transformation are known to the ordinarily skilled artisan, for example, CaCl 2 , CaPO 4 , liposome-mediated and electroporation. Depending on the host cell used, transformation is performed using standard techniques appropriate to such cells.
  • the calcium treatment employing calcium chloride, as described in Sambrook et al., supra, or electroporation is generally used for prokaryotes.
  • Infection with Agrobacterium tumefaciens is used for transformation of certain plant cells, as described by Shaw et al., Gene, 23:315 (1983 ) and WO 89/05859 published Jun. 29, 1989 .
  • DNA into cells such as by nuclear microinjection, electroporation, bacterial protoplast fusion with intact cells, or polycations, e.g., polybrene, polyornithine, may also be used.
  • polycations e.g., polybrene, polyornithine.
  • Suitable host cells for cloning or expressing the DNA in the vectors herein include prokaryote, yeast, or higher eukaryote cells.
  • Suitable prokaryotes include but are not limited to eubacteria, such as Gram-negative or Gram-positive organisms, for example, Enterobacteriaceae such as E. coli.
  • Various E. coli strains are publicly available, such as E. coli K12 strain MM294 (ATCC 31,446); E. coli X1776 (ATCC 31,537); E. coli strain W3110 (ATCC 27,325) and K5772 (ATCC 53,635).
  • suitable prokaryotic host cells include Enterobacteriaceae such as Escherichia, e.g., E. coli, Enterobacter, Erwinia, Klebsiella, Proteus, Salmonella, e.g., Salmonella typhimurium, Serratia, e.g., Serratia marcescans, and Shigella, as well as Bacilli such as B. subtilis and B. licheniformis (e.g., B. licheniformis 41P disclosed in DD 266,710 published Apr. 12, 1989 ), Pseudomonas such as P. aeruginosa, and Streptomyces. These examples are illustrative rather than limiting.
  • Strain W3110 is one particularly preferred host or parent host because it is a common host strain for recombinant DNA product fermentations. Preferably, the host cell secretes minimal amounts of proteolytic enzymes.
  • strain W3110 may be modified to effect a genetic mutation in the genes encoding proteins endogenous to the host, with examples of such hosts including E. coli W3110 strain 1A2, which has the complete genotype tonA; E. coli W3110 strain 9E4, which has the complete genotype tonA ptr3; E.
  • E. coli W3110 strain 27C7 (ATCC 55,244), which has the complete genotype tonAptr3phoA E15 (argF-lac)169 degP ompT kan.sup.r ;
  • E. coli W3110 strain 37D6 which has the complete genotype tonA ptr3 phoA E15 (argF-lac)169 degP ompT rbs7 ilvG kan.sup.r
  • E. coli W3110 strain 40B4 which is strain 37D6 with a non-kanamycin resistant degP deletion mutation; and an E. coli strain having mutant periplasmic protease disclosed in U.S. Patent No. 4,946,783 issued Aug. 7, 1990 .
  • in vitro methods of cloning e.g., PCR or other nucleic acid polymerase reactions, are suitable.
  • eukaryotic microbes such as filamentous fungi or yeast are suitable cloning or expression hosts for encoding vectors.
  • Saccharomyces cerevisiae is a commonly used lower eukaryotic host microorganism.
  • Others include Schizosaccharomyces pombe ( Beach and Nurse, Nature, 290:140 (1981 ); EP 139,383 published May 2, 1985 ); Kluyveromyces hosts ( U.S. Pat. No. 4,943,529 ; Fleer et al., Bio/Technology, 9:968-975 (1991 )) such as, e.g., K.
  • lactis (MW98-8C, CBS683, CBS4574; Louvencourt et al., J. Bacteriol., 737 (1983 )), K. fragilis (ATCC 12,424), K. bulgaricus (ATCC 16,045), K. wickeramii (ATCC 24,178), K. waltii (ATCC 56,500), K. drosophilarum (ATCC 36,906; Van den Berg et al., Bio/Technology, 8:135 (1990 )), K. thermotolerans, and K. marxianus; yarrowia ( EP 402,226 ); Pichia pastoris ( EP 183,070 ; Sreekrishna et al., J.
  • Methylotropic yeasts are suitable herein and include, but are not limited to, yeast capable of growth on methanol selected from the genera consisting of Hansenula, Candida, Kloeckera, Pichia, Saccharomyces, Torulopsis, and Rhodotorula. A list of specific species that are exemplary of this class of yeasts may be found in C. Anthony, The Biochemistry of Methylotrophs, 269 (1982 ).
  • Suitable host cells for the expression of glycosylated stretches of consecutive amino acids or polypeptides of interest are derived from multicellular organisms.
  • invertebrate cells include insect cells such as Drosophila S2 and Spodoptera Sf9, as well as plant cells.
  • useful mammalian host cell lines include Chinese hamster ovary (CHO) and COS cells. More specific examples include monkey kidney CV1 line transformed by SV40 (COS-7, ATCC CRL 1651); human embryonic kidney line (293 or 293 cells subcloned for growth in suspension culture, Graham et al., J. Gen Virol., 36:59 (1977 )); Chinese hamster ovary cells/-DHFR (CHO, Urlaub and Chasin, Proc. Natl.
  • mice sertoli cells TM4, Mather, Biol. Reprod., 23:243-251 (1980 )
  • human lung cells W138, ATCC CCL 75
  • human liver cells Hep G2, HB 8065
  • mouse mammary tumor MMT 060562, ATCC CCL51. The selection of the appropriate host cell is deemed to be within the skill in the art.
  • the nucleic acid (e.g., cDNA or genomic DNA) encoding the stretch of consecutive amino acids or polypeptides of interest may be inserted into a replicable vector for cloning (amplification of the DNA) or for expression.
  • a replicable vector for cloning (amplification of the DNA) or for expression.
  • the vector may, for example, be in the form of a plasmid, cosmid, viral particle, or phage.
  • the appropriate nucleic acid sequence may be inserted into the vector by a variety of procedures. In general, DNA is inserted into an appropriate restriction endonuclease site(s) using techniques known in the art.
  • Vector components generally include, but are not limited to, one or more of a signal sequence, an origin of replication, one or more marker genes, an enhancer element, a promoter, and a transcription termination sequence. Construction of suitable vectors containing one or more of these components employs standard ligation techniques which are known to the skilled artisan.
  • the stretches of consecutive amino acids or polypeptides of interest may be produced recombinantly not only directly, but also as a fusion polypeptide with a heterologous polypeptide, which may be a signal sequence or other polypeptide having a specific cleavage site at the N-terminus of the mature protein or polypeptide.
  • the signal sequence may be a component of the vector, or it may be a part of the encoding DNA that is inserted into the vector.
  • the signal sequence may be a prokaryotic signal sequence selected, for example, from the group of the alkaline phosphatase, penicillinase, 1pp, or heat-stable enterotoxin II leaders.
  • the signal sequence may be, e.g., the yeast invertase leader, alpha factor leader (including Saccharomyces and Kluyveromyces alpha-factor leaders, the latter described in U.S. Pat. No. 5,010,182 ), or acid phosphatase leader, the C. albicans glucoamylase leader ( EP 362,179 published Apr. 4, 1990 ), or the signal described in WO 90/13646 published Nov. 15, 1990 .
  • mammalian signal sequences may be used to direct secretion of the protein, such as signal sequences from secreted polypeptides of the same or related species, as well as viral secretory leaders.
  • Both expression and cloning vectors contain a nucleic acid sequence that enables the vector to replicate in one or more selected host cells. Such sequences are well known for a variety of bacteria, yeast, and viruses.
  • the origin of replication from the plasmid pBR322 is suitable for most Gram-negative bacteria, the 2mu plasmid origin is suitable for yeast, and various viral origins (SV40, polyoma, adenovirus, VSV or BPV) are useful for cloning vectors in mammalian cells.
  • Selection genes will typically contain a selection gene, also termed a selectable marker.
  • Typical selection genes encode proteins that (a) confer resistance to antibiotics or other toxins, e.g., ampicillin, neomycin, methotrexate, or tetracycline, (b) complement auxotrophic deficiencies, or (c) supply critical nutrients not available from complex media, e.g., the gene encoding D-alanine racemase for Bacilli.
  • selectable markers for mammalian cells are those that enable the identification of cells competent to take up the encoding nucleic acid, such as DHFR or thymidine kinase.
  • An appropriate host cell when wild-type DHFR is employed is the CHO cell line deficient in DHFR activity, prepared and propagated as described by Urlaub et al., Proc. Natl. Acad. Sci. USA, 77:4216 (1980 ).
  • a suitable selection gene for use in yeast is the trp1 gene present in the yeast plasmid YRp7 ( Stinchcomb et al., Nature, 282:39 (1979 ); Kingsman et al., Gene, 7:141 (1979 ); Tschemper et al., Gene, 10:157 (1980 )).
  • the trp1 gene provides a selection marker for a mutant strain of yeast lacking the ability to grow in tryptophan, for example, ATCC No. 44076 or PEP4-1 ( Jones, Genetics, 85:12 (1977 )).
  • Expression and cloning vectors usually contain a promoter operably linked to the encoding nucleic acid sequence to direct mRNA synthesis. Promoters recognized by a variety of potential host cells are well known. Promoters suitable for use with prokaryotic hosts include the beta-lactamase and lactose promoter systems ( Chang et al., Nature, 275:615 (1978 ); Goeddel et al., Nature, 281:544 (1979 )), alkaline phosphatase, a tryptophan (trp) promoter system ( Goeddel, Nucleic Acids Res., 8:4057 (1980 ); EP 36,776 ), and hybrid promoters such as the tac promoter ( deBoer et al., Proc. Natl. Acad. Sci. USA, 80:21-25 (1983 )). Promoters for use in bacterial systems also will contain a Shine-Dalgarno (S.D.) sequence operably linked to the encoding DNA
  • Suitable promoting sequences for use with yeast hosts include the promoters for 3-phosphoglycerate kinase ( Hitzeman et al., J. Biol. Chem., 255:2073 (1980 )) or other glycolytic enzymes ( Hess et al., J. Adv.
  • yeast promoters which are inducible promoters having the additional advantage of transcription controlled by growth conditions, are the promoter regions for alcohol dehydrogenase 2, isocytochrome C, acid phosphatase, degradative enzymes associated with nitrogen metabolism, metallothionein, glyceraldehyde-3-phosphate dehydrogenase, and enzymes responsible for maltose and galactose utilization. Suitable vectors and promoters for use in yeast expression are further described in EP 73,657 .
  • Transcription from vectors in mammalian host cells is controlled, for example, by promoters obtained from the genomes of viruses such as polyoma virus, fowlpox virus ( UK 2,211,504 published Jul. 5, 1989 ), adenovirus (such as Adenovirus 2), bovine papilloma virus, avian sarcoma virus, cytomegalovirus, a retrovirus, hepatitis-B virus and Simian Virus 40 (SV40), from heterologous mammalian promoters, e.g., the actin promoter or an immunoglobulin promoter, and from heat-shock promoters, provided such promoters are compatible with the host cell systems.
  • viruses such as polyoma virus, fowlpox virus ( UK 2,211,504 published Jul. 5, 1989 ), adenovirus (such as Adenovirus 2), bovine papilloma virus, avian sarcoma virus, cytomegalovirus, a
  • Enhancers are cis-acting elements of DNA, usually about from 10 to 300 bp, that act on a promoter to increase its transcription.
  • Many enhancer sequences are now known from mammalian genes (globin, elastase, albumin, alpha-fetoprotein, and insulin). Typically, however, one will use an enhancer from a eukaryotic cell virus.
  • Examples include the SV40 enhancer on the late side of the replication origin (bp 100-270), the cytomegalovirus early promoter enhancer, the polyoma enhancer on the late side of the replication origin, and adenovirus enhancers.
  • the enhancer may be spliced into the vector at a position 5' or 3' to the coding sequence, but is preferably located at a site 5' from the promoter.
  • Expression vectors used in eukaryotic host cells will also contain sequences necessary for the termination of transcription and for stabilizing the mRNA. Such sequences are commonly available from the 5' and, occasionally 3', untranslated regions of eukaryotic or viral DNAs or cDNAs. These regions contain nucleotide segments transcribed as polyadenylated fragments in the untranslated portion of the mRNA encoding stretches of consecutive amino acids or polypeptides of interest.
  • Gene amplification and/or expression may be measured in a sample directly, for example, by conventional Southern blotting, Northern blotting to quantitate the transcription of mRNA ( Thomas, Proc. Natl. Acad. Sci. USA, 77:5201-5205 (1980 )), dot blotting (DNA analysis), or in situ hybridization, using an appropriately labeled probe, based on the sequences provided herein.
  • antibodies may be employed that can recognize specific duplexes, including DNA duplexes, RNA duplexes, and DNA-RNA hybrid duplexes or DNA-protein duplexes. The antibodies in turn may be labeled and the assay may be carried out where the duplex is bound to a surface, so that upon the formation of duplex on the surface, the presence of antibody bound to the duplex can be detected.
  • Gene expression may be measured by immunological methods, such as immunohistochemical staining of cells or tissue sections and assay of cell culture or body fluids, to quantitate directly the expression of gene product.
  • Antibodies useful for immunohistochemical staining and/or assay of sample fluids may be either monoclonal or polyclonal, and may be prepared in any mammal. Conveniently, the antibodies may be prepared against a native sequence stretches of consecutive amino acids or polypeptides of interest or against a synthetic peptide based on the DNA sequences provided herein or against exogenous sequence fused to DNA encoding a stretch of consecutive amino acids or polypeptide of interest and encoding a specific antibody epitope.
  • Forms of the stretches of consecutive amino acids or polypeptides of interest may be recovered from culture medium or from host cell lysates. If membrane-bound, it can be released from the membrane using a suitable detergent solution (e.g. Triton-X 100) or by enzymatic cleavage. Cells employed in expression of the stretches of consecutive amino acids or polypeptides of interest can be disrupted by various physical or chemical means, such as freeze-thaw cycling, sonication, mechanical disruption, or cell lysing agents.
  • the following procedures are exemplary of suitable purification procedures: by fractionation on an ion-exchange column; ethanol precipitation; reverse phase HPLC; chromatography on silica or on a cation-exchange resin such as DEAE; chromatofocusing; SDS-PAGE; ammonium sulfate precipitation; gel filtration using, for example, Sephadex G-75; protein A Sepharose columns to remove contaminants such as IgG; and metal chelating columns to bind epitope-tagged forms.
  • the DNA sequence encoding the desired amino acid sequence of interest or polypeptide is initially amplified using selected PCR primers.
  • the primers should contain restriction enzyme sites which correspond to the restriction enzyme sites on the selected expression vector.
  • restriction enzyme sites A variety of expression vectors may be employed.
  • An example of a suitable vector is pBR322 (derived from E. coli; see Bolivar et al., Gene, 2:95 (1977 )) which contains genes for ampicillin and tetracycline resistance.
  • the vector is digested with restriction enzyme and dephosphorylated.
  • the PCR amplified sequences are then ligated into the vector.
  • the vector will preferably include sequences which encode for an antibiotic resistance gene, a trp promoter, a polyhis leader (including the first six STII codons, polyhis sequence, and enterokinase cleavage site), the specific amino acid sequence of interest / polypeptide coding region, lambda transcriptional terminator, and an argU gene.
  • the ligation mixture is then used to transform a selected E. coli strain using the methods described in Sambrook et al., supra. Transformants are identified by their ability to grow on LB plates and antibiotic resistant colonies are then selected. Plasmid DNA can be isolated and confirmed by restriction analysis and DNA sequencing.
  • Selected clones can be grown overnight in liquid culture medium such as LB broth supplemented with antibiotics.
  • the overnight culture may subsequently be used to inoculate a larger scale culture.
  • the cells are then grown to a desired optical density, during which the expression promoter is turned on.
  • the cells After culturing the cells for several more hours, the cells can be harvested by centrifugation.
  • the cell pellet obtained by the centrifugation can be solubilized using various agents known in the art, and the solubilized amino acid sequence of interest or polypeptide can then be purified using a metal chelating column under conditions that allow tight binding of the protein.
  • the primers can contain restriction enzyme sites which correspond to the restriction enzyme sites on the selected expression vector, and other useful sequences providing for efficient and reliable translation initiation, rapid purification on a metal chelation column, and proteolytic removal with enterokinase.
  • the PCR-amplified, poly-His tagged sequences can be ligated into an expression vector used to transform an E. coli host based on, for example, strain 52 (W3110 fuhA(tonA) Ion galE rpoHts(htpRts) clpP(lacIq). Transformants can first be grown in LB containing 50 mg/ml carbenicillin at 30°C with shaking until an O.D.600 of 3-5 is reached.
  • Cultures are then diluted 50-100 fold into C RAP media (prepared by mixing 3.57 g (NH 4 ) 2 SO 4 , 0.71 g sodium citrate-2H 2 O, 1.07 g KCl, 5.36 g Difco yeast extract, 5.36 g Sheffield hycase SF in 500 mL water, as well as 110 mM MPOS, pH 7.3, 0.55% (w/v) glucose and 7 mM MgSO 4 ) and grown for approximately 20-30 hours at 30°C. with shaking. Samples were removed to verify expression by SDS-PAGE analysis, and the bulk culture is centrifuged to pellet the cells. Cell pellets were frozen until purification and refolding.
  • C RAP media prepared by mixing 3.57 g (NH 4 ) 2 SO 4 , 0.71 g sodium citrate-2H 2 O, 1.07 g KCl, 5.36 g Difco yeast extract, 5.36 g Sheffield hycase SF in 500 mL water, as well as 110 mM MPOS,
  • E. coli paste from 0.5 to 1 L fermentations (6-10 g pellets) was resuspended in 10 volumes (w/v) in 7 M guanidine, 20 mM Tris, pH 8 buffer.
  • Solid sodium sulfite and sodium tetrathionate is added to make final concentrations of 0.1M and 0.02 M, respectively, and the solution was stirred overnight at 4°C. This step results in a denatured protein with all cysteine residues blocked by sulfitolization.
  • the solution was centrifuged at 40,000 rpm in a Beckman Ultracentifuge for 30 min.
  • the supernatant was diluted with 3-5 volumes of metal chelate column buffer (6 M guanidine, 20 mM Tris, pH 7.4) and filtered through 0.22 micron filters to clarify. Depending the clarified extract was loaded onto a 5 mil Qiagen Ni-NTA metal chelate column equilibrated in the metal chelate column buffer. The column was washed with additional buffer containing 50 mM imidazole (Calbiochem, Utrol grade), pH 7.4. The protein was eluted with buffer containing 250 mM imidazole. Fractions containing the desired protein were pooled and stored at 4.degree. C. Protein concentration was estimated by its absorbance at 280 nm using the calculated extinction coefficient based on its amino acid sequence.
  • This general example illustrates a preparation of a glycosylated form of a desired amino acid sequence of interest or polypeptide component by recombinant expression in mammalian cells.
  • the vector pRK5 (see EP 307,247, published Mar. 15, 1989 ) can be employed as the expression vector.
  • the encoding DNA is ligated into pRK5 with selected restriction enzymes to allow insertion of the DNA using ligation methods such as described in Sambrook et al., supra.
  • the selected host cells may be 293 cells.
  • Human 293 cells (ATCC CCL 1573) are grown to confluence in tissue culture plates in medium such as DMEM supplemented with fetal calf serum and optionally, nutrient components and/or antibiotics.
  • About 10 ⁇ g of the ligated vector DNA is mixed with about 1 ⁇ g DNA encoding the VA RNA gene [ Thimmappaya et al., Cell 31:543 (1982 )] and dissolved in 500 ⁇ l of I mM Tris-HCl, 0.1 mM EDTA, 0.227 M CaCl 2 To this mixture is added, dropwise, 500 ⁇ l of 50 mM HEPES (pH 7.35), 280 mM NaCl, 1.5 mM NaPO 4 , and a precipitate is allowed to form for 10 minutes at 25°C. The precipitate is suspended and added to the 293 cells and allowed to settle for about four hours at 37°C. The culture medium is aspirated off and 2 ml of 20% glycerol in PBS is added for 30 seconds. The 293 cells are then washed with serum free medium, fresh medium is added and the cells are incubated for about 5 days.
  • the culture medium is removed and replaced with culture medium (alone) or culture medium containing 200 ⁇ Ci/ml 35 S-cysteine and 200 ⁇ Ci/ml 35 S-methionine.
  • culture medium alone
  • culture medium containing 200 ⁇ Ci/ml 35 S-cysteine and 200 ⁇ Ci/ml 35 S-methionine After a 12 hour incubation, the conditioned medium is collected, concentrated on a spin filter, and loaded onto a 15% SDS gel.
  • the processed gel may be dried and exposed to film for a selected period of time to reveal the presence of amino acid sequence of interest or polypeptide component.
  • the cultures containing transfected cells may undergo further incubation (in serum free medium) and the medium is tested in selected bioassays.
  • the nucleic acid amino acid sequence of interest or polypeptide component may be introduced into 293 cells transiently using the dextran sulfate method described by Somparyrac et al., Proc. Natl. Acad. Sci., 12:7575 (1981 ). 293 cells are grown to maximal density in a spinner flask and 700 ⁇ g of the ligated vector is added. The cells are first concentrated from the spinner flask by centrifugation and washed with PBS. The DNA-dextran precipitate is incubated on the cell pellet for four hours.
  • the cells are treated with 20% glycerol for 90 seconds, washed with tissue culture medium, and re-introduced into the spinner flask containing tissue culture medium, 5 ⁇ g/ml bovine insulin and 0.1 ⁇ g/ml bovine transferrin. After about four days, the conditioned media is centrifuged and filtered to remove cells and debris. The sample containing expressed amino acid sequence of interest or polypeptide component can then be concentrated and purified by any selected method, such as dialysis and/or column chromatography.
  • the amino acid sequence of interest or polypeptide component can be expressed in CHO cells.
  • the amino acid sequence of interest or polypeptide component can be transfected into CHO cells using known reagents such as CaPO 4 or DEAE-dextran.
  • the cell cultures can be incubated, and the medium replaced with culture medium (alone) or medium containing a radiolabel such as 35 S-methionine.
  • the culture medium may be replaced with serum free medium.
  • the cultures are incubated for about 6 days, and then the conditioned medium is harvested.
  • the medium containing the expressed amino acid sequence of interest or polypeptide component can then be concentrated and purified by any selected method.
  • Epitope-tagged amino acid sequence of interest or polypeptide component may also be expressed in host CHO cells.
  • the amino acid sequence of interest or polypeptide component may be subcloned out of a pRK5 vector.
  • the subclone insert can undergo PCR to fuse in frame with a selected epitope tag such as a poly-his tag into a Baculovirus expression vector.
  • the poly-his tagged amino acid sequence of interest or polypeptide component insert can then be subcloned into a SV40 driven vector containing a selection marker such as DHFR for selection of stable clones.
  • the CHO cells can be transfected (as described above) with the SV40 driven vector. Labeling may be performed, as described above, to verify expression.
  • the culture medium containing the expressed poly-His tagged amino acid sequence of interest or polypeptide component can then be concentrated and purified by any selected method, such as by Ni 2+ -chelate affinity chromatography.
  • amino acid sequence of interest or polypeptide component are expressed as an IgG construct (immunoadhesin), in which the coding sequences for the soluble forms (e.g. extracellular domains) of the respective proteins are fused to an IgG1 constant region sequence containing the hinge, CH2 and CH2 domains and/or is a poly-His tagged form.
  • IgG construct immunoadhesin
  • CHO expression vectors are constructed to have compatible restriction sites 5' and 3' of the DNA of interest to allow the convenient shuttling of cDNA's.
  • the vector used in expression in CHO cells is as described in Lucas et al., Nucl. Acids Res. 24:9 (1774-1779 (1996 ), and uses the SV40 early promoter/enhancer to drive expression of the cDNA of interest and dihydrofolate reductase (DHFR).
  • DHFR expression permits selection for stable maintenance of the plasmid following transfection.
  • the following method describes recombinant expression of a desired amino acid sequence of interest or polypeptide component in yeast.
  • yeast expression vectors are constructed for intracellular production or secretion of a stretch of consecutive amino acids from the ADH2/GAPDH promoter.
  • DNA encoding a desired amino acid sequence of interest or polypeptide component, a selected signal peptide and the promoter is inserted into suitable restriction enzyme sites in the selected plasmid to direct intracellular expression of the amino acid sequence of interest or polypeptide component.
  • DNA encoding the stretch of consecutive amino acids can be cloned into the selected plasmid, together with DNA encoding the ADH2/GAPDH promoter, the yeast alpha-factor secretory signal/leader sequence, and linker sequences (if needed) for expression of the stretch of consecutive amino acids.
  • yeast cells such as yeast strain AB110
  • yeast cells can then be transformed with the expression plasmids described above and cultured in selected fermentation media.
  • the transformed yeast supernatants can be analyzed by precipitation with 10% trichloroacetic acid and separation by SDS-PAGE, followed by staining of the gels with Coomassie Blue stain.
  • Recombinant amino acid sequence of interest or polypeptide component can subsequently be isolated and purified by removing the yeast cells from the fermentation medium by centrifugation and then concentrating the medium using selected cartridge filters.
  • the concentrate containing the amino acid sequence of interest or polypeptide component may further be purified using selected column chromatography resins.
  • the following method describes recombinant expression of stretches of consecutive amino acids in Baculovirus-infected insect cells.
  • the desired nucleic acid encoding the stretch of consecutive amino acids is fused upstream of an epitope tag contained with a baculovirus expression vector.
  • epitope tags include poly-his tags and immunoglobulin tags (like Fc regions of IgG).
  • a variety of plasmids may be employed, including plasmids derived from commercially available plasmids such as pVL1393 (Novagen). Briefly, the amino acid sequence of interest or polypeptide component or the desired portion of the amino acid sequence of interest or polypeptide component (such as the sequence encoding the extracellular domain of a transmembrane protein) is amplified by PCR with primers complementary to the 5' and 3' regions. The 5' primer may incorporate flanking (selected) restriction enzyme sites. The product is then digested with those selected restriction enzymes and subcloned into the expression vector.
  • Recombinant baculovirus is generated by co-transfecting the above plasmid and BaculoGold TM virus DNA (Pharmingen) into Spodoptera frugiperda (“Sf9") cells (ATCC CRL 1711) using lipofectin (commercially available from GIBCO-BRL). After 4-5 days of incubation at 28°C, the released viruses are harvested and used for further amplifications. Viral infection and protein expression is performed as described by O'Reilley et al., Baculovirus expression vectors: A laboratory Manual, Oxford: Oxford University Press (1994 ).
  • Expressed poly-his tagged amino acid sequence of interest or polypeptide component can then be purified, for example, by Ni 2+ -chelate affinity chromatography as follows. Extracts are prepared from recombinant virus-infected Sf9 cells as described by Rupert et al., Nature, 362:175-179 (1993 ). Briefly, Sf9 cells are washed, resuspended in sonication buffer (25 mL Hepes, pH 7.9; 12.5 mM MgCl 2 ; 0.1 mM EDTA; 10% Glycerol; 0.1% NP40; 0.4 M KCl), and sonicated twice for 20 seconds on ice.
  • sonication buffer 25 mL Hepes, pH 7.9; 12.5 mM MgCl 2 ; 0.1 mM EDTA; 10% Glycerol; 0.1% NP40; 0.4 M KCl
  • the sonicates are cleared by centrifugation, and the supernatant is diluted 50-fold in loading buffer (50 mM phosphate, 300 mM NaCl, 10% Glycerol, pH 7.8) and filtered through a 0.45 ⁇ m filter.
  • loading buffer 50 mM phosphate, 300 mM NaCl, 10% Glycerol, pH 7.8
  • a Ni 2+ -NTA agarose column (commercially available from Qiagen) is prepared with a bed volume of 5 mL, washed with 25 mL of water and equilibrated with 25 mL of loading buffer.
  • the filtered cell extract is loaded onto the column at 0.5 mL per minute.
  • the column is washed to baseline A 280 with loading buffer, at which point fraction collection is started.
  • the column is washed with a secondary wash buffer (50 mM phosphate; 300 mM NaCl, 10% Glycerol, pH 6.0), which elutes nonspecifically bound protein.
  • a secondary wash buffer 50 mM phosphate; 300 mM NaCl, 10% Glycerol, pH 6.0
  • the column is developed with a 0 to 500 mM Imidazole gradient in the secondary wash buffer.
  • One mL fractions are collected and analyzed by SDS-PAGE and silver staining or western blot with Ni 2+ -NTA-conjugated to alkaline phosphatase (Qiagen). Fractions containing the eluted His 10 -tagged sequence are pooled and dialyzed against loading buffer.
  • purification of the IgG tagged (or Fc tagged) amino acid sequence can be performed using known chromatography techniques, including for instance, Protein A or Protein G column chromatography.
  • Fc containing constructs of proteins can be purified from conditioned media as follows.
  • the conditioned media is pumped onto a 5 ml Protein A column (Pharmacia) which is equilibrated in 20 mM Na phosphate buffer, pH 6.8. After loading, the column is washed extensively with equilibration buffer before elution with 100 mM citric acid, pH 3.5.
  • the eluted protein is immediately neutralized by collecting 1 ml fractions into tubes containing 275 mL of 1 M Tris buffer, pH 9.
  • the highly purified protein is subsequently desalted into storage buffer as described above for the poly-His tagged proteins.
  • the homogeneity of the proteins is verified by SDS polyacrylamide gel (PEG) electrophoresis and N-terminal amino acid sequencing by Edman degradation.
  • compositions comprising a compound comprising a stretch of consecutive amino acids which comprises consecutive amino acids having the sequence of etanercept (e.g. Enbrel) may comprise mannitol, sucrose, and tromethamine.
  • the composition is in the form of a lyophilizate.
  • the composition is reconstituted with, for example, Sterile Bacteriostatic Water for Injection (BWFI), USP (containing 0.9% benzyl alcohol).
  • BWFI Sterile Bacteriostatic Water for Injection
  • USP containing 0.9% benzyl alcohol
  • the compound is administered to a subject for reducing signs and symptoms, inducing major clinical response, inhibiting the progression of structural damage, and improving physical function in subjects with moderately to severely active rheumatoid arthritis.
  • the compound may be initiated in combination with methotrexate (MTX) or used alone.
  • MTX methotrexate
  • the compound is administered to a subject for reducing signs and symptoms of moderately to severely active polyarticular-course juvenile rheumatoid arthritis in subjects who have had an inadequate response to one or more DMARDs.
  • the compound is administered to a subject for reducing signs and symptoms, inhibiting the progression of structural damage of active arthritis, and improving physical function in subjects with psoriatic arthritis.
  • the compound is administered to a subject for reducing signs and symptoms in subjects with active ankylosing spondylitis.
  • the compound is administered to a subject for the treatment of chronic moderate to severe plaque psoriasis.
  • the compound is administered at 25-75mg per week given as one or more subcutaneous (SC) injections. In a further embodiment the compound is administered at 50mg per week in a single SC injection. In an embodiment wherein the subject has plaque psoriasis the compound is administered at 25-75mg twice weekly or 4 days apart for 3 months followed by a reduction to a maintenance dose of 25-75mg per week. In a further embodiment the compound is administered at a dose of at 50 mg twice weekly or 4 days apart for 3 months followed by a reduction to a maintenance dose of 50mg per week.
  • the dose is between 2x and 100x less than the doses set forth herein.
  • the compound may be administered at a dose of 0.2-1.2 mg/kg per week (up to a maximum of 75 mg per week).
  • the compound is administered at a dose of 0.8 mg/kg per week (up to a maximum of 50 mg per week) .
  • the dose is between 2x and 100x less than the doses set forth hereinabove.
  • compositions comprising a compound comprising a stretch of consecutive amino acids which comprises consecutive amino acids having the sequence of infliximab (e.g. Remicade) may comprise sucrose, polysorbate 80, monobasic sodium phosphate, monohydrate, and dibasic sodium phosphate, dihydrate. Preservatives are not present in one embodiment.
  • the composition is in the form of a lyophilizate.
  • the composition is reconstituted with, for example, Water for Injection (BWFI), USP.
  • BWFI Water for Injection
  • the pH of the composition is 7.2 or is about 7.2.
  • the compound is administered is administered to a subject with rheumatoid arthritis in a dose of 2-4 mg/kg given as an intravenous infusion followed with additional similar doses at 2 and 6 weeks after the first infusion then every 8 weeks thereafter.
  • the compound is administered in a dose of 3 mg/kg given as an intravenous infusion followed with additional similar doses at 2 and 6 weeks after the first infusion then every 8 weeks thereafter.
  • the dose is adjusted up to 10 mg/kg or treating as often as every 4 weeks.
  • the compound is administered in combination with methotrexate.
  • the compound is administered is administered to a subject with Crohn's disease or fistulizing Crohn's disease at dose of 2-7 mg/kg given as an induction regimen at 0, 2 and 6 weeks followed by a maintenance regimen of 4-6 mg/kg every 8 weeks thereafter for the treatment of moderately to severely active Crohn's disease or fistulizing disease.
  • the compound is administered at a dose of 5 mg/kg given as an induction regimen at 0, 2 and 6 weeks followed by a maintenance regimen of 5 mg/kg every 8 weeks thereafter for the treatment of moderately to severely active Crohn's disease or fistulizing disease.
  • the dose is adjusted up to 10 mg/kg.
  • the compound is administered to a subject with ankylosing spondylitis at a dose of 2-7 mg/kg given as an intravenous infusion followed with additional similar doses at 2 and 6 weeks after the first infusion, then every 6 weeks thereafter.
  • the compound is administered at a dose of 5 mg/kg given as an intravenous infusion followed with additional similar doses at 2 and 6 weeks after the first infusion, then every 6 weeks thereafter.
  • the compound is administered to a subject with psoriatic arthritis at a dose of 2-7 mg/kg given as an intravenous infusion followed with additional similar doses at 2 and 6 weeks after the first infusion then every 8 weeks thereafter.
  • the compound is administered at a dose of 5 mg/kg given as an intravenous infusion followed with additional similar doses at 2 and 6 weeks after the first infusion then every 8 weeks thereafter.
  • the compound is administered with methotrexate.
  • the compound is administered to a subject with ulcerative colitis at a dose of 2-7 mg/kg given as an induction regimen at 0, 2 and 6 weeks followed by a maintenance regimen of 2-7 mg/kg every 8 weeks thereafter for the treatment of moderately to severely active ulcerative colitis.
  • the compound is administered to a subject with ulcerative colitis at a dose of 5 mg/kg given as an induction regimen at 0, 2 and 6 weeks followed by a maintenance regimen of 5 mg/kg every 8 weeks thereafter.
  • the dose is between 2x and 100 ⁇ less than the doses set forth hereinabove for treating the indivisual diseases.
  • compositions when in the form of a lyophilizate, may be reconstituted with, for example, sterile aqueous solutions, sterile water, Sterile Water for Injections (USP), Sterile Bacteriostatic Water for Injections (USP), and equivalents thereof known to those skilled in the art.
  • USP Sterile Water for Injections
  • USP Sterile Bacteriostatic Water for Injections
  • the compound in administration of any of the instant compounds, may be administered in isolation, in a carrier, as part of a pharmaceutical composition, or in any appropriate vehicle.
  • the invention disclosed herein also contemplates each integer dose, and tenth thereof, between the upper and lower limits. In the case of the example given, therefore, the invention contemplates 1.0, 1.1, 1.2, 1.3, 1.4, 1.5, 1.6, 1.7, 1.8, 1.9, 2.0, 2.1, 2.2, 2.3, 2.4 etc. mg/kg up to 10mg/kg.
  • the compounds of the present invention can be administered as a single dose or may be administered as multiple doses.
  • the daily dosage for treating a disorder or condition according to the methods described above will generally range from about 0.01 to about 10.0 mg/kg body weight of the subject to be treated.
  • Variations based on the aforementioned dosage ranges may be made by a physician of ordinary skill taking into account known considerations such as the weight, age, and condition of the person being treated, the severity of the affliction, and the particular route of administration chosen.
  • pharmaceutically acceptable carrier is understood to include excipients, carriers or diluents.
  • the particular carrier, diluent or excipient used will depend upon the means and purpose for which the active ingredient is being applied.
  • solutions containing a compound of this invention or a pharmaceutically acceptable salt thereof in sterile aqueous solution may be employed.
  • aqueous solutions should be suitably buffered if necessary and the liquid diluent first rendered isotonic with sufficient saline or glucose.
  • aqueous solutions are especially suitable for intravenous, intramuscular, subcutaneous and intraperitoneal administration.
  • the sterile aqueous media employed are all readily available by standard techniques known to those skilled in the art.
  • compositions of this invention may be in a variety of forms. These include, for example, liquid, semi-solid and solid dosage forms, such as liquid solutions (e.g., injectable and infusible solutions), dispersions or suspensions. The preferred form depends on the intended mode of administration and therapeutic application. Some compositions are in the form of injectable or infusible solutions.
  • a mode of administration is parenteral (e.g., intravenous, subcutaneous, intraperitoneal, intramuscular).
  • the compound is administered by intravenous infusion or injection.
  • the compound is administered by intramuscular or subcutaneous injection.
  • compositions disclosed here can be administered in various manners, including soluble form by bolus injection, continuous infusion, sustained release from implants, oral ingestion, local injection (e.g. intracrdiac, intramuscular), systemic injection, or other suitable techniques well known in the pharmaceutical arts.
  • Other methods of pharmaceutical administration include, but are not limited to oral, subcutaneously, transdermal, intravenous, intramuscular and parenteral methods of administration.
  • a soluble composition will comprise a purified compound in conjunction with physiologically acceptable carriers, excipients or diluents. Such carriers will be nontoxic to recipients at the dosages and concentrations employed.
  • compositions can entail combining a compound with buffers, antioxidants, carbohydrates including glucose, sucrose or dextrins, chelating agents such as EDTA, glutathione and other stabilizers and excipients.
  • buffers antioxidants
  • carbohydrates including glucose, sucrose or dextrins
  • chelating agents such as EDTA, glutathione and other stabilizers and excipients.
  • Neutral buffered saline or saline mixed with conspecific serum albumin are exemplary appropriate diluents.
  • the product can be formulated as a lyophilizate using appropriate excipient solutions (e.g., sucrose) as diluents.
  • Nonproteinaceous polymer ordinarily is a hydrophilic synthetic polymer, i.e., a polymer not otherwise found in nature.
  • hydrophilic polyvinyl polymers fall within the scope of this invention, e.g. polyvinylalcohol and polyvinylpyrrolidone.
  • polyalkylene ethers such as polyethylene glycol, polypropylene glycol, polyoxyethylene esters or methoxy polyethylene glycol
  • polyoxyalkylenes such as polyoxyethylene, polyoxypropylene, and block copolymers of polyoxyethylene and polyoxypropylene (Pluronics); polymethacrylates; carbomers; branched or unbranched polysaccharides which comprise the saccharide monomers D-mannose, D- and L-galactose, fucose, fructose, D-xylose, L-arabinose, D-glucuronic acid, sialic acid, D-galacturontc acid, D-mannuronic acid (e.g.
  • polymannuronic acid or alginic acid
  • D-glucosamine D-galactosamine
  • D-glucose and neuraminic acid including homopolysaccharides and heteropolysaccharides such as lactose, amylopectin, starch, hydroxyethyl starch, amylose, dextran sulfate, dextran, dextrins, glycogen, or the polysaccharide subunit of acid mucopolysaccharides, e.g. hyaluronic acid; polymers of sugar alcohols such as polysorbitol and polymannitol; as well as heparin or heparon.
  • compositions of the invention may include a "therapeutically effective amount” or a “prophylactically effective amount” of a compound of the invention.
  • a “therapeutically effective amount” refers to an amount effective, at dosages and for periods of time necessary, to achieve the desired therapeutic result.
  • a therapeutically effective amount of the compound may vary according to factors such as the disease state, age, sex, and weight of the individual.
  • a therapeutically effective amount is also one in which any toxic or detrimental effects of the compound are outweighed by the therapeutically beneficial effects.
  • a “prophylactically effective amount” refers to an amount effective, at dosages and for periods of time necessary, to achieve the desired prophylactic result. Typically, since a prophylactic dose is used in subjects prior to or at an earlier stage of disease, the prophylactically effective amount will be less than the therapeutically effective amount.
  • the invention relates to the following aspects :
  • TNR1B-alkyne-azide-Fc6 was prepared via the reaction of alkyne-modified TNR1B (TNF receptor 1B) with azide-modified Fc6 as follows.
  • TNR1B-azide-alkyne-Fc6 is prepared using the same principles via the reaction of azide-modified TNR1B with alkyne-modified Fc6.
  • TNR1B-intein and Fc6 are described in U.S. Serial No. 11/982085, published October 16, 2008 , the whole of which is incorporated herein by reference.
  • TNR1B-intein fusion protein was produced using vector pCDNA3-TNR1B-Mth, the sequence of which is shown in SEQ ID NO: 100.
  • Cleavage of the homologous TNR signal sequences by the cellular signal peptidase provides the mature TNR1B-intein fusion protein that is secreted into the cell culture fluid, the sequence of which is shown in SEQ ID NO: 102.
  • Fc6 protein was expressed using vector pCDNA3-SHH-IgG1-Fc11, the sequence of which is shown in SEQ ID NO: 103.
  • the pre-Fc6 polypeptide that is initially expressed is shown in SEQ ID NO: 104.
  • Cleavage of the heterologous sonic hedgehog (SHH) signal sequences by the cellular signal peptidase provides the mature Fc6 protein that is secreted into the cell culture fluid, the sequence of which is shown in SEQ ID NO: 105.
  • SHH heterologous sonic hedgehog
  • Protein production was executed by transient expression in CHO-DG44 cells, adapted to serum-free suspension culture. Transient transfections were done with polyethylenimine as transfection agent, complexed with DNA, under high density conditions as described by Rajendra et al., J. Biotechnol. 153, 22-26 (2011 ). Seed train cultures were maintained in TubeSpin ® bioreactor 50 tubes obtained from TPP (Trasadingen, CH) and scaled up in volume to generate sufficient biomass for transfection. Transfections were carried out in cultures of 0.5-1.0 L. Cultures at this scale were maintained in 2 L or 5 L Schott-bottles with a ventilated cap. The bottles were shaken at 180rpm in a kuhner incubator shaker with humidification and CO 2 control at 5%. The cell culture fluid was harvested after 10 days, centrifuged and sterile-filtered, prior to purification.
  • Cystyl-propargylamide and cystyl-3-azidopropylamide were prepared as follows. Boc-Cys(Trt)-OH, (C 6 H 5 ) 3 CSCH 2 CH[NHCO 2 C (CH 3 ) 3 ] CO 2 H; propargylamine, HC ⁇ CCH 2 NH; 3-azidopropylamine, NH 2 CH 2 CH 2 CH 2 N 3 ; EDC, N -(3-Dimethylaminopropyl)-N'-ethylcarbodiimide hydrochloride; and HOBt, 1-Hydroxybenzotriazole, and were obtained from AnaSpec (Freemont, CA) or CPC Scientific (San Jose, CA).
  • the reaction was stopped with an excess of saturated NaHCO3 in water, extracted with CH2Cl2, dried over MgSO4, filtered, evaporated, and purified by column chromatography.
  • the intermediate product was dissolved at a concentration of 0.05M in TFA/triisopropylsilane/H2O (90:5:5) and stirred for 30 minutes at room temperature.
  • the reaction was then dried by evaporation and extracted with CH2Cl2.
  • the organic layer was then extracted with water, yielding the final cystyl-propargylamide product as a yellowish oil, and the final cystyl-3-azidopropylamide product as a yellowish solid.
  • the TNR1B-intein protein in the cell culture fluid was applied to a column packed with chitin beads obtained from New England BioLabs (Beverley, MA) that was pre-equilibrated with buffer A (20 mM Tris-HCl, 500 mM NaCl, pH 7.5). Unbound protein was washed from the column with buffer A.
  • Cleavage was initiated by rapidly equilibrating the chitin resin in buffer B (20 mM Tris-HCl, 500 mM NaCl, pH 8.0) containing either 50 mM cystyl-propargylamide (for alkyne-modified TNR1B) or 50 mM cystyl-3-azidopropylamide (for azide-modified TNR1B) and incubation was carried out for 24 to 96 hours at room temperature.
  • buffer B (20 mM Tris-HCl, 500 mM NaCl, pH 8.0
  • 50 mM cystyl-propargylamide for alkyne-modified TNR1B
  • 50 mM cystyl-3-azidopropylamide for azide-modified TNR1B
  • the cleaved alkyne-modified TNR1B (SEQ ID NO: 106) or azide-modified TNR1B proteins (SEQ ID NO: 107) were eluted from the column with buffer A, concentrated using an Amicon Ultracel-3 Centrifugal Filter Unit from Millipore (Billerica, MA), dialyzed against Dulbecco's phosphate buffered saline without Ca or Mg salts (PBS) obtained from the UCSF Cell Culture Facility (San Francisco, CA), and stored at 4°C prior to use.
  • buffer A concentrated using an Amicon Ultracel-3 Centrifugal Filter Unit from Millipore (Billerica, MA), dialyzed against Dulbecco's phosphate buffered saline without Ca or Mg salts (PBS) obtained from the UCSF Cell Culture Facility (San Francisco, CA), and stored at 4°C prior to use.
  • FIG 2 shows SDS-polyacrylamide gel electrophoresis (SDS-PAGE) analysis of the alkyne-modified TNR1B, compared with cysteine-modified TNR1B (SEQ ID NO: 108) prepared using 50 mM cysteine instead of cystyl-propargylamide.
  • SDS-PAGE was carried out using NuPAGE ® Novex Bis-Tris Midi Gels (10%) obtained from Invitrogen (Carlsbad, CA). Proteins were visualized using Silver Stain Plus or Bio-Safe Coomassie Stain obtained from Bio-Rad (Hercules, CA).
  • Azide-modified Fc6 was prepared by the reaction of Fc6 protein with various azide-containing peptide thioesters ( Figure 3 ) and azide-containing PEG thioesters ( Figure 4 ).
  • Alkyne-modified Fc6 was prepared by the reaction of alkyne-containing thioesters with Fc6 protein.
  • Recombinant Fc6 protein was expressed in Chinese hamster ovary (CHO) cells as described for TNR1B-intein (see above) and purified by Protein A affinity chromatography. The culture supernatant was applied to a column packed with rProtein A Fast Flow from Pharmacia (Uppsala, Sweden) pre-equilibrated with PBS. The column was washed extensively with PBS and the Fc6 protein then eluted with 0.1 M glycine buffer pH 2.7. Fractions were collected into tubes containing 0.05 vol/vol of 1.0 M Tris-HCl pH 9.0 (giving a final pH of 7.5), pooled, dialyzed against PBS, and stored at 4°C prior to use.
  • Table 1 shows representative azide-containing and alkyne-containing peptide/PEG thioesters.
  • Thioesters were synthesized by an Fmoc/t-Butyl solid-phase strategy on a 2-chlorotrityl chloride resin preloaded with the Fmoc-Thr(tBu)-OH.
  • Amino acid derivatives were obtained from CPC Scientific (Sunnyvale, CA), Fmoc-PEG n -OH derivatives were obtained from Quanta BioDesign (Powell, OH), and 2-(1H-benzotriazole-1-yl)-1,1,3,3-tetramethylaminium hexafluorophosphate (HBTU), dichloromethane (DCM), trichloroacetic acid (TFA), N,N'-diisopropylcarbodiimide (DIC), 1-hydroxybenzotriazole (HOBt), N,N'-diisopropylethylamine (DIEA) and triisopropylsilane (TIS) were obtained from Sigma (St.
  • the thioester of the peptides was formed by treating the crude protected peptide with DIC/HOBt/DIEA and benzyl mercaptan or thiophenol in DCM overnight. After concentration, the crude protected peptide thioester was precipitated by multiple triturations with cold ether followed by centrifugation. Deprotection was carried out by treatment of the crude protected product with 95:2.5:2.5 TFA/TIS/H 2 O for 2hours at room temperature.
  • Azide-modified Fc6 and alkyne-modified Fc6 were prepared by native chemical ligation as follows.
  • 2-(N-morpholino)ethanesulfonic acid (MES) was obtained from Acros (Morris Plains, NJ)
  • tris(2-carboxyethyl)phosphine (TCEP) was obtained from Pierce (Rockford, IL)
  • 4-mercaptophenylacetic acid (MPAA) was obtained from Sigma-Aldrich (St. Louis, MO). Reactions were carried out by ligating the various thioesters shown in Table 1 with the Fc6 protein as follows.
  • Reactions (100 uL) contained 50 mM MES buffer, pH 6.5, 0.8 mM TCEP, 10 mM MPAA, 4 mg/ml of the peptide thioester, and 0.5 mg/ml of the Fc6 protein. Following overnight incubation at room temperature, reactions were adjusted to pH 7.0 with 0.05 vol/vol of 1.0 M Tris-HCl pH 9.0, purified using Protein A Magnetic Beads from New England BioLabs, dialyzed in 0.1 M phosphate pH 8.0, and concentrated.
  • Figure 5 shows SDS-PAGE analysis demonstrating that Fc6 protein (lane 1) reacted quantitatively with azide-DKTHT-thioester to yield the Az-DKTHT-Fc6 protein (lane 2) and azide-PEG 4 -DKTHT-thioester to yield the Az-PEG 4 -DKTHT-Fc6 protein (lane 3).
  • the sequence of the Az-DKTHT-Fc6 protein is shown in SEQ ID NO: 110 and the sequence of the Az-PEG 4 -DKTHT-Fc6 is hown in SEQ ID NO: 111.
  • the PEG 4 oligomer gave an incremental size increase comparable to the 5 amino acid DKTHTDsequence.
  • TNR1B-alkyne-azide-Fc6 was prepared via the reaction of the alkyne-modified TNR1B with the Az-DKTHT-Fc6 protein ( Figure 6 ) and the Az-PEG 4 -DKTHT-Fc6 protein ( Figure7 ).
  • Sodium phosphate, dibasic (anhydrous) and sodium phosphate, monobasic (monohydrate) were obtained from Acros, TCEP was from Pierce, CuSO 4 (pentahydrate) was from Sigma-Aldrich, and Tris[1-benzyl-1H-1,2,3-triazol-4-yl)methyl]amine (TBTA) from AnaSpec (Freemont, CA).
  • Reactions contained 0.1 M sodium phoshate, pH 8.0, 1.0 mM CuSO 4 , 2.0 mM TBTA, the alkyne-modified TNR1B (30 ug), and either the unmodified Fc6 protein, the Az-DKTHT-Fc6 protein, or the Az-PEG 4 -DKTHT-Fc6 protein (10 ug). Reactions were initiated by the addition of 2.0 mM TCEP, and incubated overnight at room temperature. The reaction products were purified using Protein A Magnetic Beads to remove any unreacted alkyne-modified TNR1B.
  • FIG. 8 shows SDS-PAGE analysis of the TNR1B-alkyne-azide-Fc6 products under reducing conditions.
  • both Az-DKTHT-Fc6 (lane 2) and Az-PEG 4 -DKTHT-Fc6 (lane 5) gave a single band of Mr ⁇ 28-30,000 daltons (arrow d) corresponding to the input azide-modified Fc6 proteins, with no sign of any product formation.
  • Figure 9 shows SDS-PAGE analysis comparing the TNR1B-alkyne-azide-Fc6 reaction products (left panel) and the TNR1B-alkyne-azide-PEG 4 -Fc6 reaction products (right panel) with TNR1B-Fc fusion protein (etanercept).
  • the TNR1B-alkyne-azide-Fc6 product of Mr ⁇ 75,000 daltons (lane 2), having the predicted sequence shown in SEQ ID NO: 112, and the TNR1B-alkyne-azide-PEG 4 -Fc6 product of Mr ⁇ 75,000 daltons (lane 4), having the predicted sequence of shown in SEQ ID NO: 113, are essentially indistinguishable in size from etanercept (lanes 1, 3), the sequence of which is shown in SEQ ID NO: 114.
  • Figure 10 shows SDS-PAGE analysis providing further evidence confirming the requirement of the alkyne and azide groups for reactivity.
  • Reaction mixtures that contained alkyne-modified TNR1B with unmodified Fc6 protein gave no reaction product (lane 2) compared with Fc6 alone (lane 1), while alkyne-modified TNR1B with Az-DKTHT-Fc6 gave the expected products (lane 4) compared with Az-DKTHT-Fc6 alone (lane 3).
  • no carryover of the input alkyne-modified TNR1B shown in lane 5 was apparent following the Protein A purification.
  • the TNR1B-alkyne-azide-Fc6 products of Figure 10 were further characterized by sequencing of their tryptic peptide by LC-MS. Following SDS-PAGE, the gel was Coomassie stained and four gel regions were excised, corresponding to the Mr ⁇ 75,000 product (arrow a), the Mr ⁇ 65,000 product (arrow b), the unstained region where alkyne-modified TNR1B would migrate (arrow c), and the unreacted Az-DKTHT-Fc6 protein of Mr ⁇ 28,000 (arrow d). The four gel slices were diced into small small pieces ( ⁇ 0.5-1.0 mm 3 ) and processed as follows.
  • the acetonitrile was discarded, and the gel slices dried in a Speed Vac (Savant Instruments, Farmingdale, NY). Reduction and alkylation was then carried out by rehydrating the gel slices in 40 ul of 10 mM dithiothreitol in 25 mM NH 4 HCO 3 , vortexing, and incubated at 56°C for 45 minutes. The supernatant was then discarded, 40 uL of 55 mM iodoacetamide in 25 mM NH 4 HCO 3 was added, the gel slices vortexed and incubated in the dark for 30 minutes at room temperature. The supernatant was discarded, the gel slices again dehydrated in acetonitrile and dried in a Speed Vac.
  • Trypsin digestion was then carried out by rehydrating the gel slices in 25 uL of trypsin (12.5 ug/mL) in 25 mM NH 4 HCO 3 on ice for 60 minutes. Excess trypsin solution was then removed, the gel slices covered with 25 mM NH 4 HCO 3 and incubated at 37°C overnight. The supernatant was removed, and the gel then extracted twice with 30 uL of 50% acetonitrile/0.1% formic acid in water. The organic extracts were combined with the aqueous supernatant, reduced to a volume of 10 uL in a Speed Vac, then analysed by LC-MS using a Q-Star Elite mass spectrometer (AB SCIEX, Foster City, CA).
  • Figure 11 summarizes the characterization of the structure of the TNR1B-alkyne-azide-Fc6 reaction product by mass spectrometry.
  • the peptide coverage of the alkyne-modified TNR1B sequence (upper panel) extended from the N-terminal region (EYYDQTAQMCCSK) to the C-terminal region (SMAPGAVHLPQPVST).
  • TNR1B-alkyne-azide-Fc6 and TNR1B-alkyne-azide-PEG 4 -Fc6 products of Figure 10 were further characterized for their biological activity by measuring their ability to bind TNF- ⁇ using surface plasmon resonance (SPR).
  • SPR surface plasmon resonance
  • Recombinant human TNF- ⁇ protein (carrier-free) was obtained from R&D Systems and reconstituted in PBS. SPR studies were carried out using a Biacore T100 instrument from Biacore AB (Uppsala, Sweden).
  • TNR1B-alkyne-azide-Fc6 and TNR1B-alkyne-azide-PEG 4 -Fc6, were immobilized onto a CM5 sensor chip, Series S, using a Amine Coupling Kit (BR-1000-50) obtained from GE Healthcare (Piscataway, NJ) according to the manufacturer's instructions. Binding of TNF- ⁇ was carried out at 25°C in 10 mM Hepes buffer pH 7.4, 150 mM NaCl, 3mM EDTA, and 0.005% Tween-20.
  • Binding was evaluated in duplicate at TNF- ⁇ concentrations of 0.156 nM, 0.312 nM, 0.625 nM, 1.25 nM, 2.5 nM, 5.0 nM, 10.0 nM, 20.0 nM and 40 nM. Data was evaluated using Biacore T100 Evaluation Software, version 2.0.3.
  • Figure 12 shows the kinetic binding curves for TNR1B-alkyne-azide-Fc6 (left panel) and TNR1B-alkyne-azide-PEG 4 -Fc6 (right panel). Both products showed saturable TNF- ⁇ binding, and an excellent fit was obtained employing a two-exponential model (Chi 2 ⁇ 0.05). Table 2 summarizes the kinetic binding data.
  • Azide-containing and Alkyne-Containing Thioesters Name Formula Mr MH + Sequence Az-DKTHT C 33 H 47 O 10 N 11 S 789.86 780.60 Azide- DKTHT-thioester Az-PEG 4 -DKTHT C 44 H 68 O 15 N 12 S 1037.14 1038.20 Azide-PEG 4 -DKTHT-thioester Az-PEG 12 -DKTHT C 59 H 98 O 23 N 12 S 1375.55 1376.26 Azide-PEG 12 -DKTHT-thioester Az-PEG 24 -DKTHT C 83 H 146 O 35 N 12 S 1904.18 1904.80 Azide-PEG 24 -DKTHT- thioester Az-PEG 36 -DKTHT C 107 H 194 O 47 N 12 S 2432.82 2434.40 Azide-PEG 36 -DKTHT-thioester Alk-PEG 12 C 53 H 74 O 15 N 2 S
  • TNF- ⁇ binding measured by surface plasmon resonance Surface-bound ligand ka1 (1/Ms) kd1 (1/s) KD1 (M) Rmax1 ka2 (1/Ms) kd2 (1/s) KD2 (M) Rmax2 Chi 2 TNR1B-Alk-Az-DKTHT-Fc6 1.252E+7 0.003744 2.990E-10 2.5 5.176E+6 0.03392 6.553E-9 3.9 0.0514 TNR1B-Alk-Az-PEG4-DKTHT-Fc6 1.400E+7 0.002613 1.866E-10 3.0 5.129E+6 0.03021 5.890E-9 4.8 0.0503 Abbreviations: ka, on-rate (measured); kd, off-rate (measured); KD, dissociation constant (calculated).
  • Fab'-alkyne-azide-Fc6 was prepared via the reaction of cycloalkyne-modified Fab' with azide-modified Fc6 as follows.
  • Adalimumab (Humira) was obtained as a liquid formulation (50 mg/ml) from Abbott (Abbott Park, IL).
  • the Fab' fragment was prepared using IdesS protease to first generate Fab'2 fragment followed by selective reduction of the interchain disulfides with 2-mercaptoethylamine ( Figure 13 ).
  • Antibody (10 mg) was exchanged into cleavage buffer (50 mM sodium phosphate, 150 mM NaCl, pH 6.6) using a Slide-A-Lyzer Mini Dialysis Unit, 10K MWCO from Pierce (Rockford, IL), then incubated with his-tagged recombinant IdeS immobilized on agarose beads (FragIT MidiSpin column) from Genovis (Lund, Sweden) for 1 hour at room temperature with constant mixing. The beads were removed from the digest solution by centrifugation, washed twice with cleavage buffer, and the digest and wash solutions then combined and applied to a HiTrap Protein A HP column from GE Life Sciences (Piscataway, NJ) to remove Fc' fragment and undigested antibody.
  • cleavage buffer 50 mM sodium phosphate, 150 mM NaCl, pH 6.6
  • 10K MWCO Slide-A-Lyzer Mini Dialysis Unit
  • 10K MWCO 10K MWCO from Pierce (Rockford, IL)
  • Fab'2 fragment Flow-through fractions containing the Fab'2 fragment were reduced to the Fab' fragment by adding 1 mL aliquots to a vial containing 6 mg 2-mercaptoethylamine (MEA) from Pierce. Reductions were carried out with 10 mM EDTA to minimize re-oxidation of the interchain disulfides. Following incubation at 37°C for 110 min, excess MEA was removed by buffer-exchange into PBS containing 10 mM EDTA using a PD-10 desalting column from GE Life Sciences (Piscataway, NJ). The eluate containing the Fab' fragment was concentrated using an Amicon Ultracel-3 Centrifugal Filter Unit from Millipore (Billerica, MA).
  • MEA 2-mercaptoethylamine
  • Figure 14 shows SDS-PAGE analysis of adalimumab after cleavage with IdeS (panel A), followed by Protein A chromatography and mild reduction with MEA (panel B).
  • a strong reducing agent dithiothreitol
  • the whole antibody migrated as a heavy chain of Mr ⁇ 55,000 (arrow a) and a light chain of Mr ⁇ 25,000 (arrow d).
  • IdeS cleaved the heavy chain (lane 2) into a C-terminal fragment of Mr ⁇ 29,000 (arrow b) and an N-terminal fragment of Mr ⁇ 26,000 (arrow c).
  • the light chain and the N-terminal heavy chain fragment comprise the Fab'2 domain, while the C-terminal heavy chain fragment comprises the Fc' domain.
  • the Protein A column efficiently removed the Fc' domain from the Fab' domain (compare lane 2 with lanes 5 and 6). Under non-reducing conditions, the Fab'2 domain migrated as a single species of Mr ⁇ 110,000 (lane 3), while the Fab' domain produced by mild reduction with MEA migrated as a single species of Mr ⁇ 55,000 (lane 4). Under reducing conditions, the Fab'2 domain (lane 5) and the Fab' domain (lane 6) both yielded the same light chain (arrow d) and N-terminal heavy chain fragment (arrow c), as expected. Thus, the Fab' domain obtained by this procedure was essentially free of the Fab' 2 and Fc' domains.
  • Cycloalkyne-modified Fab' was prepared from the adalimumab Fab' domain using a bifunctional linker, DIBAC-PEG 12 -Lys(Mal), which contains a maleimide group capable of reacting with the free thiol groups on the Fab' fragment ( Figure 15 ).
  • DIBAC-PEG 12 -Lys(Mal) was prepared using an Fmoc solid-phase synthesis strategy.
  • Lys(Mtt)-Wang resin and succinimido 3-maleimidopropanoate were obtained from CPC Scientific (Sunnyvale, CA)
  • Fmoc- N -amido-dPEG 12 -acid was obtained from Quanta BioDesign (Powell, OH)
  • 5-(11,12-Didehydrodibenzo[ b , f ]azocin-5(6 H )-yl)-5-oxopentanoic acid, an acid-functionalised aza-dibenzocyclooctyne (DIBAC-acid) was synthesized as described by Debets, M. F. et al., Chem. Commun.
  • Fmoc- N -amido-dPEG 12 -acid and DIBAC-acid were sequentially reacted with Lys(Mtt)-Wang resin to obtain DIBAC-PEG 12 -Lys(Mtt)-Wang resin, then treated with TFA/DCM/TIS(1:96:3) to remove the Mtt group.
  • the deprotected resin was reacted with Mpa-OSu on the free amino group on the lysine side chain to obtain DIBAC-PEG12-Lys(Mpa)-Wang resin.
  • Figure 16 shows the chemical modification of adalimumab Fab' fragment with the DIBAC-PEG 12 -Lys(Mal) linker and the purification of the resulting cycloalkyne-modified Fab'.
  • reactions 0.535 mL
  • 0.1 M sodium phosphate at pH 7.0 and pH 7.4
  • each containing 5 mg of Fab' fragment and 10 mg of DIBAC-PEG 12 -Lys (Mal) .
  • the two reactions were combined and buffered-exchanged into 20 mM sodium acetate, 20 mM NaCl, pH 5.5 using a PD-10 column.
  • the eluate (3.5 mL) was applied to a HiTrap SP HP cation-exchange column from GE Life Sciences which retained all the unmodified Fab' and residual Fab'2.
  • the flow-through fractions (5.5 mL) containing the purified cycloalkyne-modified Fab' ( Figure 16b ) were pooled, adjusted to pH 7.0 with 10x PBS (0.55 mL), and concentrated by affinity chromatography on a Protein L column (Capto L) from GE Life Sciences.
  • the cycloalkyne-modified Fab' was eluted from the Protein L column with 0.1 M glycine HCl pH 2.7 (2.4 mL), neutralized with 1/20 volume 1.0 M Tris HCl pH 9.0, buffered-exchanged into PBS using a PD-10 column (3.5 mL) and concentrated using Amicon Ultracel-3 Centrifugal Filter Unit to a final volume of 70 uL at a concentration of 9.5 mg/mL.
  • Figure 17 shows analysis by SDS-PAGE under reducing conditions of the Fc6 (lane 1) Az-DKTHT-Fc6 (lane 2), Az-DKTHT-PEG 12 -Fc6 (lane 3), Az-DKTHT-PEG 24 -Fc6 (lane 4), and Az-DKTHT-PEG 36 -Fc6 (lane 5) proteins by SDS-PAGE.
  • the Fc6 protein reacted quantitatively (> 90%) with all four thioesters, yielding a ladder of products of increasing size.
  • Figure 18 shows analysis by size-exclusion chromatography (SEC) to confirm that the four azide-modified Fc6 protein products had the same dimeric structure as the parent Fc6 molecule.
  • SEC was carried out using a Prominence HPLC System (Shimadzu Corp, Kyoto, Japan). TSKgel Super SW3000 columns (4.6 mm ⁇ 30 cm column, 4.6 mm ⁇ 5 cm guard column) were obtained from TOSOH Bioscience (Tokyo, Japan). Mobile phase, flow rate, column temperature, and detection wavelength used were 50 mM sodium phosphate, 300mM NaCl, pH 7.4, 0.35 mL/min., 30°C, and 280 nm, respectively.
  • the four azide-modified Fc6 protein products displayed a retention time that decreased as the size of PEG linker increased, confirming their dimer structure. All four products also gave essentially a single peak, demonstrating a two-handed structure in which both N-termini of the parent Fc6 dimer were modified by the PEG linker that was confirmed by SDS-PAGE analysis under non-reducing conditions (see below).
  • the cyclooctyne-modified Fab' was reacted with all four azide-modified Fc6 molecules ( Figure 19 ), yielding a family of Fab'-PEG y -cycloalkyne-azide-PEG x -Fc6 structures with arms of increasing length ( Figure 20 ).
  • Figure 21 shows SDS-PAGE analysis of the Fab'-cycloalkyne-azide-Fc6 reaction under reducing and non-reducing conditions.
  • the cycloalkyne-modified Fab' (lanes 5, 7, 9, and 11)
  • all four of the azide-modified Fc6 proteins gave a single band on both reducing and non-reducing gels, confirming their dimeric, two-handed handed structure.
  • the cycloalkyne-modified Fab' (lanes 4, 6, 8, and 10)
  • all four of the azide-modified Fc6 proteins were largely consumed in the resulting reaction.
  • all four reactions gave a product with Mr ⁇ 57,000 to 62,000 (arrow a).
  • the size of the Fab' -PEG 12 -Fc6 product was approximately 1-2 kD greater than the wild-type adalimumab heavy chain (lane 1), while the sizes of the Fab' -PEG 24 -Fc6 (lane 6), Fab' -PEG 36 -Fc6 (lane 8), and Fab' -PEG 48 -Fc6 (lane 10) products further increased with the overall length of the PEG linker. Under non-reducing conditions, two products were observed, a first product of Mr ⁇ 155,000 to 160,000 (arrow a), and a second of Mr ⁇ 110,000 to 115,000 (arrow b).
  • the larger Fab' -PEG 12 -Fc6 product (lane 4) was approximately 5 kD greater than the adalimumab whole antibody (lane 1), consistent with the expected two-handed product, while the larger Fab' -PEG 24 -Fc6 (lane 6), Fab' -PEG 36 -Fc6 (lane 8), and Fab' -PEG 48 -Fc6 (lane 10) products still further increased in size as the overall length of the PEG linker increased.
  • Figure 22 shows analysis by SEC to confirm the two-handed structure (ie, two Fab' hands attached to one Fc6 domain) of the larger reaction product with Mr ⁇ 155,000 to 160,000 of the Fab' -PEG 12 -Fc6, Fab' -PEG 24 -Fc6, Fab' -PEG 36 -Fc6, and Fab'-PEG 48 -Fc6 reactions. All four reaction products displayed a shorter retention time than the adalimumab whole antibody that further decreased as the size of PEG linker increased, confirming the two-handed structure observed by SDS-PAGE analysis.
  • the biological activity of the Fab'-cycloalkyne-azide-Fc6 products evaluated by their ability to neutralize TNF- ⁇ -mediated cytotoxicity on murine WEHI cells treated with actinomycin D.
  • the mouse WEHI-13VAR cell line (ATCC CRL-2148) was obtained from the American Type Culture Collection (Rockville, MD) and grown in Gibco RPMI media 1640 (RPMI-1640) supplemented with 10% fetal bovine serum (FBS) and penicillin and streptomycin (10 U/ml), obtained from Life Technologies (Grand Island, NY).
  • TNF- ⁇ cytotoxity assays were carried out as follows.
  • WEHI-13VAR cells were plated in 96-well Nunc white cell culture plates obtained from Thermo Fisher (Waltham, MA) at 2 ⁇ 10 4 cells per well overnight and then treated with actinomycin D (0.5 pg/ml) obtained from Sigma (St Louis, MO) and TNF- ⁇ (0.2 ng/ml) in the absence or presence of TNFR-IgG or other inhibitors.
  • Figure 23 shows the neutralization of TNF- ⁇ -mediated cytotoxicity by Fab' -PEG 12 -Fc6, Fab' -PEG 24 -Fc6, Fab' -PEG 36 -Fc6, and Fab' -PEG 48 -Fc6 reaction mixtures compared with the cycloalkyne-modified Fab' (based upon an equal amounts of input cycloalkyne-modified Fab').
  • the Fab' -PEG 12 -Fc6 and Fab'-PEG 24 -Fc6 reaction mixtures both displayed comparable TNF- ⁇ neutralization activity compared with that of the input cycloalkyne-modified Fab' (upper panel), whereas the Fab'-PEG 36 -Fc6 and Fab' -PEG 48 -Fc6 reaction mixtures displayed a 1.5-fold and 2.0-fold increase, respectively, in their TNF- ⁇ neutralization activity compared with the input cycloalkyne-modified Fab' (lower panel).
  • the two-handed products of the Fab' -PEG 36 -Fc6 and Fab' -PEG 48 -Fc6 reactions are estimated to be at least 7.5-fold and 10-fold greater than the input cycloalkyne-modified Fab', respectively.
  • Fab-alkyne-azide-Fc6 is prepared by reacting azide-modified Fc6 with an alkyne-modified or cycloalkyne-modified Fab protein that is produced by cleavage of an Fab-intein fusion protein as follows.
  • Fab-azide-alkyne-Fc6 is prepared by reacting alkyne-modified or cycloalkyne-modified Fc6 with an azide-modified Fab protein that is produced by cleavage of an Fab-intein fusion protein.
  • Adalimumab Fab-intein fusion protein is produced by cotransfecting expression vector pFUSE2ss-DE27-VK-CLIg-hk (SEQ ID NO: 115) with pPUSEss-DE27-V ⁇ 1-CHIg-hG1-Mth-1 (SEQ ID NO: 116) or pFUSEss-DE27-V ⁇ 1-CHIg-hG1-Mth-2 (SEQ ID NO: 117).
  • Vector pFUSE2ss-DE27-VK-CLIg-hk directs the expression of the pre-kappa light chain of adalimumab shown in SEQ ID NO: 118.
  • Cleavage of the heterologous IL-2 signal sequence by the cellular signal peptidase provides the mature kappa light chain of adalimumab shown in SEQ ID NO: 119.
  • Vector pFUSEss-DE27-V ⁇ 1-CHIg-hG1-Mth-1 directs the expression of a first type of pre-heavy chain-intein chimeric polypeptide shown in SEQ ID NO: 120, in which the adalimumab heavy chain VH and CH1 domains are joined at their C-terminus to the N-terminus of an RIR1 self-splicing intein at the autocleavage site. Cleavage of the heterologous IL-2 signal sequence by the cellular signal peptidase provides the mature heavy chain-intein fusion protein shown in SEQ ID NO: 121. Together, the proteins of SEQ ID NO: 119 and SEQ ID NO: 121 comprise the adalimumab Fab-1-intein fusion protein that is secreted into the cell culture fluid.
  • Vector pFUSEss-DE27-V ⁇ 1-CHIg-hG1-Mth-2 directs the expression of a second type of pre-heavy chain-intein chimeric polypeptide shown in SEQ ID NO: 122, in which the adalimumab heavy chain VH and CH1 domains are joined at their C-terminus to the N-terminus of an RIR1 self-splicing intein at the autocleavage site.
  • Cleavage of the heterologous IL-2 signal sequence by the cellular signal peptidase provides the mature heavy chain-intein fusion protein shown in SEQ ID NO: 123.
  • the proteins of SEQ ID NO: 119 and SEQ ID NO: 123 comprise the adalimumab Fab-2-intein fusion protein that is secreted into the cell culture fluid.
  • Protein production is executed by transient expression in CHO-DG44 cells essentially as described in Example 1, by the cotransfection of SEQ ID NO: 115 with SEQ ID NO: 116 to produce the adalimumab Fab-1-intein fusion protein, and by cotransfection of SEQ ID NO: 115 with SEQ ID NO: 117 to produce adalimumab Fab-2-intein fusion protein.
  • Alkyne-modified adalimumab Fab proteins are produced by cleavage of adalimumab Fab-intein fusion proteins with 50 mM cystyl-propargylamide essentially as described in Example 1.
  • the adalimumab Fab-1-intein fusion protein is cleaved with cystyl-propargylamide to produce alkyne-modified adalimumab Fab-1 protein which is a heterodimer protein of SEQ ID NO: 119 and SEQ ID NO: 124.
  • the adalimumab Fab-2-intein fusion protein is cleaved with cystyl-propargylamide to produce alkyne-modified adalimumab Fab-2 protein which is a heterodimer protein of SEQ ID NO: 119 and SEQ ID NO: 125.
  • Azide-modified adalimumab Fab proteins are produced by cleavage of adalimumab Fab-intein fusion proteins with 50 mM cystyl-3-azidopropylamide essentially as described in Example 1.
  • the adalimumab Fab-1-intein fusion protein is cleaved with cystyl-3-azidopropylamide to produce azide-modified adalimumab Fab-1 protein which is a heterodimer protein of SEQ ID NO: 119 and SEQ ID NO: 126.
  • the adalimumab Fab-2-intein fusion protein is cleaved with cystyl-3-azidopropylamide to produce azide-modified adalimumab Fab-2 protein which is a heterodimer protein of SEQ ID NO: 119 and SEQ ID NO: 127.
  • Adalimumab Fab-1-alkyne-azide-Fc6 and Adalimumab Fab-2-alkyne-azide-Fc6 are prepared via the reaction of alkyne-modified adalimumab Fab-1 protein or alkyne-modified adalimumab Fab-2 protein with Az-DKTHT-Fc6 protein ( Figure 6 ) or Az-PEG x -DKTHT-Fc6 proteins ( Figure 7 ).
  • Tris(3-hydroxypropyltriazolylmethyl)amine (THTPA) is prepared as described by Hong et al., Angew. Chem. Int. Ed. 48, 1-7 (2009 ). Reactions are carried out in 0.1 M sodium phosphate, pH 7.0, with the Linker-Fc at a concentration of 5 mgs/mL or greater, and a molar ratio of > 2:1 of Fab-A:Linker-Fc. To the reaction is added a final concentration of 0.0001 M CuSO 4 , 0.0005 M THTPA. The reaction is initiated by adding to a final concentration 0.005 M aminoguanidine and 0.005 M sodium ascorbate.
  • the reaction mixture is applied to a chromatographic column packed with Protein A (GE Lifesciences, NJ) to remove excess reagent and unreacted Fab-A, washed with PBS, eluted with 0.1 M Glycine-HCl, pH 2.7, and immediately neutralized by adding 1.0 M Tris-HCl, pH 9.0.
  • the eluted Adalimumab Fab-1-alkyne-azide-Fc6 and Adalimumab Fab-2-alkyne-azide-Fc6 products are dialysed against PBS.
  • Adalimumab Fab-1-azide-alkyne-Fc6 and Adalimumab Fab-2-azide-alkyne-Fc6 are prepared via the reaction of azide-modified adalimumab Fab-1 protein or azide-modified adalimumab Fab-2 protein with cycloalkyne-modified Fc6 protein.
  • Cycloalkyne-modified Fc6 proteins are prepared essentially as described in Example 1 using DIBAC-PEG 12 -thioester (Table 1) and other DIBAC-PEG x -thioesters and DIBAC-PEG x -DKTHT-thioesters similarly prepared.
  • Azidoacetyl-DKTHT-thiophenol was prepared as described in Example 1 (calculated for C 32 H 45 O 10 N 11 S [M+H] + 776.8, found 776.3) .
  • Azidoacetyl-PEG48-DKTHT-thiophenol was prepared by solid-phase by the sequential condensation of Fmoc-PEG12-OH and Fmoc-PEG36-OH obtained from Quanta BioDesign (calculated for C 134 H 247 N 13 O 60 S [M+H]+ 3032.5, found 3032.8).
  • Each reaction (2 mL) contained 50 mM MES pH 6.5, 10 mM mercaptophenylacetic acid, 2.2 mg of Fc6, and one of the five thioesters as follows: azidoacetyl-DKTHT-thiophenol (5mg), azidoacetyl-PEG12-DKTHT-thiophenol (5mg), azidoacetyl-PEG24-DKTHT-thiophenol (10mg), azidoacetyl-PEG36-DKTHT-thiophenol (10mg), or azidoacetyl-PEG48-DKTHT-thiophenol (20mg).
  • Figure 24 shows the purified N 3 -Px-Fc proteins by SDS-PAGE under reducing (left) and non-reducing conditions (right): Fc6 control (lanes a), N 3 -P0-Fc (lanes b), N 3 -P12-Fc (lanes c), N 3 -P24-Fc (lanes d), N 3 -P36-Fc (lanes e), and N 3 -P48-Fc (lanes f).
  • the size of N 3 -Px-Fc proteins increased with PEG linker length.
  • N 3 -Px-Fc proteins prepared without TCEP were indistinguishable by SDS-PAGE from the size of N 3 -Px-Fc proteins prepared with TCEP ( Figure 17 ) .
  • GLP1-triazole-Fc hybrid immunoglobulins (GLP1-P4-DN-Px-Fc) were prepared by reacting a GLP-1 (glucagon-like peptide 1) analog, further modified to have a cyclooctyne functional group, with each of the five N 3 -Px-Fc proteins of Example 4.
  • HGEGTFTSDVSSYLEEQAAKEFIAWLVKGRG-PEG 3 -C-NH 2 corresponds to residues 7-37 of the native GLP-1 peptide, in which glycine is substituted for alanine at position 8 and glutamic acid is substituted for glycine at position 22.
  • the GLP-1 analog has a PEG3 linker and cysteine residue at its C-terminus used to attach the cyclooctyne functional group.
  • This GLP-1 analog gly8-glu22-GLP-1(7-37)-PEG3-cys-NH 2 , was prepared by SPPS (calculated for C 165 H 253 N 43 O 53 S [M+H] + 3720.3, found 3721.3).
  • a cyclooctyne functional group was added to gly8-glu22-GLP-1(7-37)-PEG3-cys-NH 2 using a heterobifunctional linker, DBCO-PEG4-Maleimide, containing a maleimide group capable of reacting with the free thiol group on the C-terminal cysteine residue ( Figure 25 ).
  • DBCO-PEG4-Maleimide C 50 H 54 N 4 O 9 , mol weight 854.92
  • the linker was dissolved at a concentration of 25 mg/mL in dimethysulfoxide (DMSO) obtained from Sigma-Aldrich (St.
  • Reactions contained 50 mM MES pH 6.5, 5 mM EDTA, 0.45 mg of gly8-glu22-GLP-1(7-37)-PEG3-cys-NH 2 peptide and 0.9 mg/mL of the DBCO-PEG4-Maleimide linker. Reactions were carried out for 30 minutes at room temperature. Excess unreacted linker was removed using a 5 mL HiTrap Desalting Column obtained from GE Life Sciences. Figure 25 shows the structure of the resulting cyclooctyne-modified GLP-1 analog reaction product (GLP1-P7-DBCO).
  • GLP1-P7-DBCO was reacted individually with each one of the five N 3 -Px-Fc proteins ( Figure 26 ), to generate a series of GLP1-P7-triazole-Px-Fc hybrid immunoglobulins ( Figure 27 ).
  • Each reaction (1.5 mL) contained 0.1 M sodium phosphate pH 7.0, 0.375 mg of the GLP1-P7-DBCO peptide, and 0.5 mg of one of the five N 3 -Px-Fc proteins. Reactions were carried out for 3.5 hours at room temperature, the reactions were purified by HiTrap Protein A HP chromatography, desalted and concentrated as described in Example 4.
  • Figure 28 shows the purified GLP1-triazole-Fc hybrid immunoglobulins by SDS-PAGE under reducing conditions (left) and non-reducing conditions (right): Fc6 control (lanes a), GLP1-P4-DN-P0-Fc (lanes b), GLP1-P4-DN-P12-Fc (lanes c), GLP1-P4-DN-P24-Fc (lanes d), GLP1-P4-DN-P36-Fc (lanes e), and GLP1-P4-DN-P48-Fc (lanes f).
  • the size of GLP1-triazole-Fc hybrid immunoglobulins increased with PEG linker length comparable to the N 3 -Px-Fc proteins.
  • Figure 29 directly compares the GLP1-triazole-Fc hybrid immunoglobulins and N 3 -Px-Fc proteins by SDS-PAGE under reducing conditions: Fc6 control (lane a), N 3 -P0-Fc (lane b), GLP1-P4-DN-P0-Fc (lane c), N 3 -P12-Fc (lane d), GLP1-P4-DN-P12-Fc (lane e), N 3 -P24-Fc (lane f), GLP1-P4-DN-P24-Fc (lane g), N 3 -P36-Fc (lane h), GLP1-P4-DN-P36-Fc (lane i), N 3 -P48-Fc (lane j), GLP1-P4-DN-P48-Fc (lane k). The conversion of each N 3 -Px-Fc protein to the corresponding GLP1-P4-DN-Px-Fc hybrid immunoglobulin was
  • the biological activity of the GLP1-P7-triazole-Px-Fc hybrid immunoglobulins was evaluated in a cell-based assay that measured the induction of cAMP synthesis in cells expressing the human GLP-1 receptor (GLP-1R).
  • Dulbecco's Modified Eagle Medium from Invitrogen (Grand Island, NY), fetal bovine serum (FBS), penicillin, streptomycin, and geneticin sulfate (G418) were obtained from Corning (Manassas, VA), the CalPhos transfection kit was obtained from Clontech (Mountain View, CA), human GLP-1 receptor expression plasmid was obtained from GeneCopoeia (Rockville, MD), and anti-human GLP-1R-phycoerythrin monoclonal antibody was obtained from R&D Systems (Minneapolis, MN).
  • DMEM Dulbecco's Modified Eagle Medium
  • FBS fetal bovine serum
  • penicillin streptomycin
  • G418 geneticin sulfate
  • IBMX 3-isobutyl-1-methylxanthine
  • cAMP dynamic 2 kit was obtained from Cisbio Bioassays (Bedford, MA)
  • GLP-1(7-37) peptide was obtained from AnaSpec (No. 20761).
  • GLP-1R-expressing cells were prepared by transfecting a GLP-1R expression vector (EX-A0510-M02) into human 293T embryonic kidney cells using a CalPho mammalian transfection kit. Transfected cells were grown in DMEM supplemented with 10% FBS and penicillin and streptomycin (10 IU/ml), and selection for stable transfectants was carried out in same media containing 2 mg/ml G418. GLP-1R expression was evaluated by flow cytometric analysis using a anti-human GLP-1R-phycoerythrin monoclonal antibody.
  • 293T-GLP-1R cells were plated overnight into 384-well tissue culture treated white microtiter plates (Corning No. 3704) at a density of 5,000, 8,000 or 10,000 cells/well in 20uL medium/well. The following day, serial dilutions of agonist (GLP-1 peptide or the GLP1-triazole-Fc hybrid immunoglobulins) in 20uL PBS containing 0.5 mM IBMX were added to the cells, and the cells then incubated at 37°C for 1, 4 or 24 hours.
  • agonist GLP-1 peptide or the GLP1-triazole-Fc hybrid immunoglobulins
  • cAMP levels were determined by Homogeneous Time-Resolved Fluorescence (HTRF) in a ClarioStar microplate reader (BMG Labtech) using a Cisbio cAMP dynamic 2 kit according to the manufacturer's instructions.
  • HTRF detection reagents anti-cAMP Mab labeled with Cryptate (20uL) and the cAMP labeled with d2 dye (20uL), the plates were incubated for 1 hour at room temperature and the fluorescence ratio (665nm/620nm) calculated and used to determine the cAMP concentration in the cell lysates by four-parameter fit to a cAMP standard curve.
  • a series of cyclooctyne-modified Fc proteins (DIBAC-P11-DN-Px-Fc), each having a cyclooctyne functional group at its N-terminus is prepared by reacting a homobifunctional cyclooctyne linker with the azide-modified N 3 -Px-Fc proteins of Example 4.
  • the linker, DIBAC-PEG11-DIBAC, shown in Figure 31 was obtained from CPC Scientific (calculated for C 74 H 102 N 6 O 17 [M+H]+ 1346.6, found 1346.4).
  • the PEG11 portion of this linker was derived from diamido-dPEG11-diamine (Quanta Biodesigns No.
  • DIBAC-PEG11-DIBAC is reacted individually with each one of the five N 3 -Px-Fc proteins ( Figure 31 ), to generate a series of DIBAC-P11-DN-Px-Fc proteins ( Figure 32 ). Representative results are shown for the reaction of DIBAC-PEG11-DIBAC with the N 3 -PO-Fc protein to generate DIBAC-P11-DN-P0-Fc.
  • the reaction (1 mL) was initiated by adding 84 mg of the N 3 -Px-Fc protein to 11.25 mg of the DIBAC-PEG11-DIBAC linker in 0.02 M sodium phosphate pH 7.0 in water-ethanol (0.64:0.36 vol/vol).
  • the reaction was carried out for 12 hours at room temperature, and the DIBAC-PEG11-DIBAC linker was then extracted by adding 1 mL of PBS, mixing well, and centrifuging at 12,000 x g which separated out the linker as an denser, oily phase.
  • the desired DIBAC-P11-DN-P0-Fc product contained within the upper aqueous phase was purified by HiTrap Protein A HP chromatography, desalted and concentrated as described in Example 4.
  • Figure 33 shows the DIBAC-P11-DN-P0-Fc reaction product by SDS-PAGE under reducing conditions: Fc6 control (lane b), unpurified reaction product (lanes c-e), the purified N 3 -P0-Fc protein (lane f), and the purified DIBAC-P11-DN-P0-Fc protein (lane g). Approximately, 70% of the N 3 -P0-Fc (I) protein was converted into a product having the expected size of the DIBAC-P11-DN-P0-Fc (II) protein.
  • DNA-P11-DN-Px-Fc A series of DNA-triazole-Fc hybrid immunoglobulins (DNA-P11-DN-Px-Fc) are prepared by reacting an azide-modified DNA or RNA, with each of the five DIBAC-P11-DN-Px-Fc proteins of Example 7.
  • Figure 34 shows the structure of the azide-modified DNA, 5AzD-let7d, having the sequence 5'-AGAGGTAGTAGGTTGCATAGTT-3' (SEQ ID NO:203) of the DNA coding strand for the mature human hsa-let-7d-5p miRNA (www.mirbase.org, Accession No. MIMAT0000065).
  • the 5AzD-let7d oligonucleotide (5AzD-let7d) was obtained from Integrated DNA Technologies (Coralville, IA). Prior to use, 5AzD-let7d (molecular weight 7187.8) was dissolved in 10 mM Tris HCl, 1 mM EDTA.
  • 5AzD-let7d was reacted individually with each of the DIBAC-P11-DN-Px-Fc proteins ( Figure 34 ) to generate a series of DNA-triazole-Fc hybrid immunoglobulins ( Figure 35 ). Representative results are shown for the reaction of 5AzD-let7d with the DIBAC-P11-DN-P0-Fc protein. Reactions (20 ul) contained 0.1 M sodium phosphate pH 7.0, 50 ug of 5AzD-let7d or a series of two-fold dilutions thereof, and 5.7 ug of the DNA-P11-DN-Px-Fc protein. Reactions were carried out at room temperature for 2 hours.
  • Figure 36 shows the reaction products by SDS-PAGE under reducing conditions: the 5AzD-let7d oligonucleotide concentration (mg/ml) was as follows: markers (lane a), 0 (lane b), 2.5 (lane c), 1.25 (lane d), 0.063 (lane e), 0.031 (lane f), 0.016 (lane g), 0.08 (lane h). Approximately 90% of the DIBAC-P11-DN-P0-Fc (II) protein was converted into a product having the expected size of the DNA-ND-P11-DN-PEG0-Fc (III) hybrid immunoglobulin.
  • a series of azide-modified trastuzumab proteins (N 3 -Px-Hc), each having an azide functional group at the N-terminus of its heavy chain, and optionally a PEG linker, is prepared by reacting a trastuzumab protein variant, cys1H-IgG1, with thioesters having the sequence azidoacetyl-Px-DKTHT-thiophenol ( Figure 37 ).
  • Cys1H-IgG1 consists of the wild-type trastuzumab light chain shown in SEQ ID NO: 128, and a variant trastuzumab heavy chain, having at its heavy chain N-terminus a cysteine residue.
  • the cys1H-IgG1 heavy chain is initially initially expressed as the variant trastuzumab pre-heavy chains shown in SEQ ID NO: 167, SEQ ID NO: 168, and SEQ ID NO: 169, having a SHH signal peptide, IFN signal peptide, and CETP signal peptide, respectively. Cleavage of the heterologous signal sequences by the cellular signal peptidase provides the mature heavy chain protein having an N-terminal cysteine, the sequence of which is shown in SEQ ID NO: 166.
  • a second series of azide-modified trastuzumab proteins (N3-Px-Lc), each having an azide functional group at the N-terminus of its light chain, and optionally a PEG linker, is prepared by reacting a trastuzumab protein variant, cys1L-IgG1, with thioesters having the sequence azidoacetyl-Px-DKTHT-thiophenol ( Figure 38 ).
  • Cys1L-IgG1 consists of the wild-type trastuzumab heavy chain shown in SEQ ID NO: 129, and a variant trastuzumab light chain, having at its heavy chain N-terminus a cysteine residue.
  • the cys1L-IgG1 light chain is initially initially expressed as the variant trastuzumab pre-light chains shown in SEQ ID NO: 131, SEQ ID NO: 132, and SEQ ID NO: 133 having a SHH signal peptide, IFN signal peptide, and CETP signal peptide, respectively.
  • Cleavage of the heterologous signal sequences by the cellular signal peptidase provides the mature light chain protein having an N-terminal cysteine, the sequence of which is shown in SEQ ID NO: 130.
  • Appropriate light and heavy chain expression vectors are co-transfected to produce the cys1H-IgG1 and cysL-IgG proteins. Protein production is executed by transient expression in CHO-DG44 cells, adapted to serum-free suspension culture followed by Protein A purification, as described in Example 1.
  • Example 10 Mertansine-triazole-trastuzumab hybrid immunoglobulins
  • a series of mertansine-triazole-trastuzumab hybrid immunoglobulins are prepared by reacting the maytansinoid DM1 (mertansine), further modified to have a cyclooctyne functional group, with each of the N 3 -Px-Hc and N 3 -Px-Lc proteins of Example 9.
  • DM1 (free thiol form; M.W. 737.5 g/mole) is prepared as described previously in U.S. Patent Nos. 5,208,020 and 6,333,410 B1 , which are hereby incorporated by reference.
  • a cyclooctyne functional group is added to DM1 using the DBCO-PEG4-Maleimide heterobifunctional linker which contains a maleimide group capable of reacting with the free thiol group of DM1 ( Figure 39 ).
  • DM1 is reacted with DBCO-PEG4-Maleimide in DMSO using the procedures of Example 5.
  • the cycloctyne-modified-DM1 product (DM1-P4-DBCO) is purified by HPLC, and dissolved in DMSO prior to use.
  • DM1-P4-DBCO is reacted individually with each one of the five N3-Px-Hc proteins ( Figure 40 ), to generate a series of mertansine-triazole-trastuzumab hybrid immunoglobulins modified with DM1 at the N-terminus of the trastuzumab heavy chain (DM1-P4-triazole-Px-Hc) ( Figure 41 ).
  • DM1-P4-DBC0 is reacted individually with each one of the five N3-Px-Lc proteins ( Figure 42 ), to generate a series of mertansine-triazole-trastuzumab hybrid immunoglobulins modified with DM1 at the N-terminus of the trastuzumab light chain (DM1-P4-triazole-Px-Lc) ( Figure 43 ).
  • Tet-Px-Fc A series of tetrazine-modified Fc proteins (Tet-Px-Fc), each having a tetrazine group at its N-terminus and optionally a PEGx linker was prepared by reacting a heterobifunctional linker with the azide-modified N 3 -Px-Fc proteins of Example 4.
  • Figure 44 shows the Tetrazine-DBCO heterobifunctional linker, which has a cycloctyne group at one end capable reacting with the azide group of the N 3 -Px-Fc proteins, and a tetrazine group at the other end.
  • the Tetrazine-DBCO linker was obtained from Click Chemistry Tools (Item No. 1022; C 32 H 29 N 7 O 6 S, protonated; molecular weight 639.68, protonated). Prior to use, Tetrazine-DBCO was dissolved at a concentration of 25 mg/mL in water.
  • Tetrazine-DBCO was reacted individually with each N 3 -Px-Fc protein ( Figure 44 ) to generate the corresponding series of Tet-Px-Fc proteins ( Figure 45 ).
  • Reactions (0.72 mL) contained 0.1 M sodium phosphate pH 7.0, 0.1875 mg of the Tetrazine-DBCO linker, and 0.6 mg of the N 3 -Px-Fc protein. Reactions were carried out for 3.5 hours at room temperature. Excess unreacted linker was removed by HiTrap ProteinA HP chromatography.
  • FIG 46 shows the purified Tet-Px-Fc proteins by SDS-PAGE under reducing (left) and non-reducing conditions (right): Fc6 control (lanes a), Tet-P0-Fc (lanes b), Tet-P12-Fc (lanes c), Tet-P24-Fc (lanes d), Tet-P36-Fc (lanes e), and Tet-P48-Fc (lanes f).
  • the size on SDS-PAGE of the Tet-Px-Fc proteins increased as the PEG linker length increased, under both reducing and non-reducing conditions.
  • each of the Tet-Px-Fc proteins was larger than the corresponding N 3 -Px-Fc protein by SDS-PAGE under reducing conditions ( Figure 50 ).
  • TCO-PEG12-DBCO transcyclooctene-modified Fc proteins
  • Figure 47 shows the TCO-PEG12-DBCO heterobifunctional linker, which has a cycloctyne group at one end capable reacting with the azide group of the N 3 -Px-Fc proteins, and a transcyclooctene group at the other end.
  • the TCO-PEG12-DBCO linker was obtained from Click Chemistry Tools (Item No. 1005; C 54 H 81 N 3 O 16 ; molecular weight 1028.23) . Prior to use, TCO-PEG12-DBCO was dissolved at a concentration of 100 mg/mL in DMSO.
  • TCO-PEG12-DBCO is reacted individually with each N 3 -Px-Fc protein ( Figure 47 ) to generate the corresponding series of Tco-P12-Px-Fc proteins ( Figure 48 ). Representative results are shown for the reaction of TCO-PEG12-DBCO with the N 3 -P36-Fc protein. Reactions (6 uL) contained 0.1 M sodium phosphate pH 7.0, 0.2 mg of the TCO-PEG12-DBCO linker or a series of two-fold dilutions thereof in DMSO, and 5 ug of the N 3 -P36-Fc protein. Reactions were carried out for 3.5 hours at room temperature.
  • FIG. 49 shows the Tco-P12-Px-Fc proteins by SDS-PAGE under reducing conditions: the Tco-P12-DBCO linker concentration (mg/ml) was as follows: 32 (lane a), 16 (lane b), 8 (lane c), 4 (lane d), 2 (lane e), 1 (lane f), 0.5 (lane g), 0.25 (lane h), 0.125 (lane i), and 0 (lane j).
  • the conversion the N 3 -P36-Fc (I) protein into the Tco-P12-P36-Fc (II) protein was essentially complete at a Tco-P12-DBCO linker concentration of 1 mg/ml (lane f).
  • the Tco-P12-P36-Fc protein thereby obtained was purified by HiTrap ProteinA HP chromatography, desalted and concentrated as described in Example 4.
  • Tco-P12-P36-Fc protein was first reacted with the heterobifunctional Tetrazine-DBCO linker to prepare DBCO-TT-P12-P36-Fc protein, which was purified by Protein A and then tested for its ability to react with an azido-PEG-amine linker, NH 2 -PEG23-N 3 , obtained from Quanta Biodesigns (Item No. 10525, C 4 H 9 N 4 O 23 , molecular weight 1099.30).
  • test reactions (6 uL) contained 0.1 M sodium phosphate pH 7.0, 0.2 mg of the NH 2 -PEG23-N 3 linker or a series of two-fold dilutions thereof, and 5 ug of the DBCO-TT-P12-P36-Fc protein. Reactions were carried out for 1 hour at room temperature.
  • Figure 50 shows the reaction products by SDS-PAGE under reducing conditions: the NH 2 -PEG23-N 3 linker concentration (mg/ml) was as follows: 0.12 (lane a), 0.06 (lane b), 0.03 (lane c), 0.015 (lane d), 0.0075 (lane e), 0.0038 (lane f), 0.002 (lane g), 0.001 (lane h), 0 (lane i).
  • GLP1-dihydropyridizine-Fc hybrid immunoglobulins were prepared by reacting a transcyclooctene-modified GLP-1 analog with the Tet-Px-Fc proteins of Example 11.
  • GLP1-dihydropyridizine-Fc hybrid immunoglobulins are also prepared by reacting a tetrazine-modified GLP-1 analog with the Tco-Px-Fc proteins of Example 12.
  • TCO-PEG3-Maleimide which contains a maleimide group capable of reacting with the free thiol group on the C-terminal cysteine residue
  • Click Chemistry Tools Item No. 1002
  • the linker was dissolved at a concentration of 25 mg/mL in DMSO.
  • Reactions (0.42 ml) contained 50 mM MES pH 6.5, 5mM EDTA, 0.45 mg of gly8-glu22-GLP-1(7-37)-PEG3-cys-NH 2 peptide and 0.375 mg of the TCO-PEG3-Maleimide linker. Reactions were carried out at room temperature for 60 minutes. Excess unreacted linker was removed by buffer-exchange into 0.02 M sodium phosphate pH 7.0 using a 5 mL HiTrap Desalting Column.
  • Figure 51 shows the structure of the transcyclooctene-modified GLP-1 analog (GLP1-P6-Tco).
  • the GLP1-P6-Tco peptide was reacted individually with each of the Tet-Px-Fc proteins ( Figure 52 ), to generate the GLP1-P3-TT-Px-Fc series of hybrid immunoglobulins ( Figure 53 ). Reactions (0.99 ml) contained 0.1 M sodium phosphate pH 7.0, 0.145 mg of GLP1-P6-Tco peptide and 0.33 mg of each Tet-Px-Fc proteins. Reactions were carried out at room temperature for 30 minutes. The GLP1-P6-TT-Px-Fc hybrid immunoglobulins were then purified by chromatography on HiTrap Protein A HP.
  • Tetrazine-PEG4-Maleimide which contains a maleimide group capable of reacting with the free thiol group on the C-terminal cysteine residue ( Figure 54 ).
  • Tetrazine-PEG4-Maleimide (C 29 H 39 N 7 O, mol weight 613.66) was obtained from Click Chemistry Tools (Item No. A139).
  • the linker Prior to use, the linker is dissolved at a concentration of 25 mg/mL in DMSO.
  • Reactions (0.42 ml) contain 50 mM MES pH 6.5, 5mM EDTA, 0.45 mg of gly8-glu22-GLP-1(7-37)-PEG3-cys-NH2 peptide and 0.375 mg of the Tetrazine-PEG4-Maleimide linker. Reactions are carried out at room temperature for 60 minutes. Excess unreacted linker is removed by buffer-exchange into 0.02 M sodium phosphate pH 7.0 using a 5 mL HiTrap Desalting Column.
  • Figure 54 shows the structure of the tetrazine-modified GLP-1 analog (GLP1-P7-Tet).
  • the GLP1-P7-Tet peptide is reacted individually with each of the Tco-Px-Fc proteins ( Figure 55 ), to generate the GLP1-P7-TetTco-Px-Fc series of hybrid immunoglobulins ( Figure 56 ). Reactions (0.99 ml) contain 0.1 M sodium phosphate pH 7.0, 0.145 mg of GLP1-P7-Tet peptide and 0.33 mg of each Tco-Px-Fc protein. Reactions are carried out at room temperature for 30 minutes. The GLP1-P7-Tet/Tco-Px-Fc hybrid immunoglobulins are then purified by chromatography on HiTrap Protein A HP.
  • Figure 57 shows the purified GLP1-dihydropyridizine-Fc hybrid immunoglobulins by SDS-PAGE under reducing conditions (left) and non-reducing conditions (right): Fc6 control (lanes a), GLP1-P6-TT-P0-Fc (lanes b), GLP1-P6-TT-P12-Fc (lanes c), GLP1-P6-TT-P24-Fc (lanes d), GLP1-P6-TT-P36-Fc (lanes e), and GLP1-P6-TT-P48-Fc (lanes f).
  • the size of GLP1-dihydropyridizine-Fc hybrid immunoglobulins increased with PEG linker length comparable to the Tet-Px-Fc proteins.
  • Figure 58 directly compares the N3-Px-Fc (I) proteins, the Tet-Px-Fc (II) proteins, and the GLP1-dihydropyridizine-Fc (III) hybrid immunoglobulins by SDS-PAGE under reducing conditions: Fc6 control (lane a), N 3 -P0-Fc (lane b), Tet-P0-Fc (lane c), GLP1-P6-TT-P0-Fc (lane d), N 3 -P12-Fc (lane e), Tet-P12-Fc (lane f), GLP1-P6-TT-P12-Fc (lane g), N 3 -P24-Fc (lane h), Tet-P24-Fc (lane i), GLP1-P6-TT-P24-Fc (lane j), N 3 -P36-Fc (lane k), Tet-P36-Fc (lane 1), GLP1-P6-TT-P
  • Figure 59 shows a time course for the reaction of GLP1-P7-DBC0 with N 3 -P36-Fc and a time course for the reaction of GLP1-P6-Tco with Tet-P36-Fc. Reactions were carried out as described above for the various times indicated, except that each reaction was terminated by the addition of an excess of competitor.
  • sodium azide was added to a final concentration of 0.1%; for the reaction of GLP1-P6-Tco with Tet-P36-Fc, TCO-PEG3-Maleimide was added to a final concentration of 3.5 mg/ml.
  • GLP-1(7-37) Stimulation by GLP-1(7-37) was similar whether cells were exposed to agonist for 1, 4 or 24 hours, with an EC50 of ⁇ 2 nM at 24 hours, whereas stimulation by the GLP1-dihydropyridizine-Fc hybrid immunoglobulins increased dramatically as cells were exposed to agonist for longer times, with an EC50 of ⁇ 0.2 nM at 24 hours.
  • Fab-P3-TT-Px-Fc A series of Fab-dihydropyridizine-Fc hybrid immunoglobulins (Fab-P3-TT-Px-Fc) were prepared by reacting a transcycloctene-modified Fab fragment with the Tet-Px-Fc proteins of Example 11.
  • Fab-dihydropyridizine-Fc hybrid immunoglobulins are also prepared by reacting a a tetrazine-modified Fab fragment with the Tco-Px-Fc proteins of Example 12.
  • TCEP-treated Fab was reacted with a heterobifunctional linker, TCO-PEG3-Maleimide, which contains a maleimide group capable of reacting with a free thiol group on the TCEP-treated Fab ( Figure 61 ).
  • the Fab fragment was generated by papain digestion of 10 mg of adalimumab (Humira TM ) obtained from Abbott using a Pierce TM Fab Preparation Kit (Cat. No. 44985) according to the manufacturer's instructions. Following digestion, the Fab fragment was purified by chromatography on HiTrap Protein A HP to remove the Fc fragment and undigested antibody. The flow-through fractions, containing the Fab fragment, were buffer-exchanged into PBS, and concentrated to 5 mg/ml.
  • reactions (0.26 ml) contained 0.1 M sodium phosphate pH 7.0, 0.5 mg of Fab, and 0.08 mg/ml TCEP. Following incubation for at room temperature for 60 minutes, the reaction was brought to 0.72 ml with the addition of 0.24 ml of 0.3 M sodium phosphate pH 7.0 and 0.22 ml of water. The TCO-PEG3-Maleimide linker was then added to the reaction (0.12 ml of at a concentration of 50 ug/ml in DMSO) and the reaction incubated for 20 minutes at room temperature.
  • transcyclooctene-modified Fab was buffered-exchanged on a PD-10 column into 0.02 M sodium phosphate pH 7.0 to remove excess linker, and the final product concentrated to 2.7 mg/ml. Under these conditions, greater than 90% of the Fab heavy chain and less than 10% of the Fab light chain was modified by the TCO-PEG3-Maleimide linker.
  • Figure 61 shows the structure of the transcyclooctene-modified Fab protein (Fab-P3-Tco).
  • the Fab-P3-Tco protein was reacted individually with each of the Tet-Px-Fc proteins ( Figure 62 ), to generate the Fab-P3-TT-Px-Fc series of hybrid immunoglobulins ( Figure 63 ). Reactions (6 ul) contained 0.1 M sodium phosphate pH 7.0, 3.6 ug of the Fab-P3-Tco protein and 1ug of each Tet-Px-Fc protein. Reactions were carried out at room temperature for 60 minutes.
  • Figure 64 shows the Fab-dihydropyridizine-Fc hybrid immunoglobulins by SDS-PAGE under reducing conditions: markers (lanes a), adalimumab (lane b), Fab-P3-TT-P0-Fc (lane c), Fab-P3-TT-P12-Fc (lane d), Fab-P3-TT-P24-Fc (lanes e), Fab-P3-TT-P36-Fc (lanes f), Fab-P3-TT-P48-Fc (lane g), Fab-P3-Tco (lane h), Tet-P0-Fc (lane i), Tet-P12-Fc (lane j), Tet-P24-Fc (lane k), Tet-P36-Fc (lane l)m Tet-P48-Fc (lane m).
  • the Fab-dihydropyridizine-Fc hybrid immunoglobulins had the expected size, showing an increase with PEG linker length comparable to the Tet-Px-Fc proteins.
  • the conversion of each Tet-Px-Fc protein to the corresponding Fab-P3-TT-Px-Fc hybrid immunoglobulin was approximately 75%.
  • hybrid immunoglobulins are prepared with an azide-derivative of a primary amine, secondary amine or alcohol compound.
  • the azide-derivatized compond may be prepared as described in Pothukanuri, S. and Winssinger, N., Org Lett. 2007; 9(11):2223-5 , hereby incorporated by reference.
  • the primary amine, secondary amine or alcohol compound is first reacted with chloroalkyl chloroformate to obtain the chloroalkyl carbamate, followed by an azide displacement of the chloride, affording the azidoalkyl carbamate. All chemicals are obtained from Sigma-Aldrich.
  • Olanzapine (Sigma Cat. No. 01141) is first reacted with chloromethyl chloroformate as described in U.S. Patent application 13/801,344, published October 10, 2013 , Publication No. US20130267505 A1 , hereby incorporated by reference.
  • a solution of olazapine (60 mmoles) and triethylamine (120 mmoles) in anhydrous dichloromethane (250 ml) is warmed to 35°C until a clear solution is formed, then cooled to 5°C. Chloromethyl chloroformate (90 mmoles) is then added over 20 minutes.
  • chloroalkyl chloroformates include 2-chloroethyl chloroformate, 3-chloropropyl chloroformate, and 4-chlorobutyl chloroformate.
  • the reaction is stirred at room temperature for 30 min and allowed to warm to room temperature. After 15 min at room temperature the reaction mixture is diluted with dichloromethane (100 ml) then washed with aqueous saturated NaHCO 3 (75 ml) and water (350 ml). The organic phase is dried over MgSO4 and filtered. The organic phase is then concentrated under vacuum at 45°C to a volume of 150 ml. The mixture is diluted with 30 ml ethyl acetate and is further evaporated (20-30 ml) under vacuum.
  • the azide-olanzapine derivative is then used to prepare series of olanzapine-dihydropyridizine-Fc hybrid immunoglobulins (Ola-P12-TT-Px-Fc) as follows.
  • the azide-olanzapine derivative is modified with a transcyclooctene functional group using a heterobifunctional linker.
  • the transcycloctene-modified olanzapine is reacted with the Tet-Px-Fc proteins of Example 11.
  • the azide-olanzapine derivative is reacted with the heterobifunctional linker TCO-PEG12-DBCO which contains a cyclooctyne group capable of reacting with the azide group ( Figure 65 ).
  • Reactions (1 ml) contain 0.5 mg of the azide-olanzapine deivative and 5 mg of the TCO-PEG12-DBCO linker in DMSO. Reactions are carried out at room temperature for 3 to 20 hours.
  • the transcycloctene-modified olanzapine (Ola-P12-Tco) is purified by HPLC to remove excess unreacted TCO-PEG12-DBCO linker. Prior to use, Ola-P12-Tco is dissolved at a concentration of 1 mg/mL in DMSO.
  • Ola-P12-Tco is reacted individually with each of the Tet-Px-Fc proteins ( Figure 66 ), to generate the Ola-P12-TT-Px-Fc series of hybrid immunoglobulins ( Figure 67 ).
  • Reactions (1 ml) contain 0.1 mg of GLP1-P7-Tet peptide and 0.33 mg of each Tco-Px-Fc protein in DMSO. Reactions are carried out at room temperature for 60 minutes.
  • the Ola-P12-TT-Px-Fc hybrid immunoglobulins are then purified by chromatography on HiTrap Protein A HP.
  • aspects of the present invention provide the chemical semisynthesis of antibodies with nonprotein hinges that incorporate large binding domains such as the Fab itself or receptor extracellular domains.
  • the present invention relates to the identification of ligation reactions that are compatible with the native structure and function of the cognate proteins and proceed efficiently.
  • aspects of the present invention provide compounds having nonprotein chains that are both flexible and extendible.
  • Antibody-like molecules provided in embodiments of the invention have enormous potential as therapeutic candidates with improved binding affinity for their disease targets.

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